ASP.NET Membership + User Creation configuration - c#

I'm writing a small website in ASP.NET C#.
I've already made a database which will receive the user data and various other things.
Now I want to register users. I've found the MembershipUser and MembershipCreateStatus class and enum to be often used for this.
However, even though my database is seen in the Server Explorer of Visual Studio, I can't seem to link the User-creation to that database.
What I want is when I do this:
MembershipUser newUser = Membership.CreateUser(username.Text, password.Text, email.Text);
It ends up in the database and table of my choice. I can't find how to configure this.

The ASP.Net membership provider uses its own tables/stored procedures for storing user data.
http://msdn.microsoft.com/en-us/library/yh26yfzy.aspx
You can use your own table for profile info (that is, non-authentication information) using either the ProfileProvider or by using the guid assigned by in the aspnet_Users table as a key for your own table and retrieving the profile record after authentication occurs.

From the Visual Studio command prompt run the following:
aspnet_regsql -S [my server, eg: (local)\SQLEXPRESS] -E -A all -d [my database]
This will attach the ASP.NET user required stored procedures and tables to your database so that the built in Membership and Role Providers can actualy work.
use the WAT tool in VS to create your initial users if you need so you can test right away.

Related

C# Entity Framework error when MSSQL server has View any database = denied

We use MSSQL for our C# .NET Framework 4.8 Application using Entity Framework for database related activities.
But on our production environment the SQL server has the Securable: View any database on Deny.
The database for the application exists but Entity Framework cannot see the database and tries to create it, this results in the CREATE DATABASE permission denied in database 'master' error.
I am using CreateDatabaseIfNotExists and MigrateDatabaseToLatestVersion in my Application_Start().
Now the issue (I think) lies with CreateDatabaseIfNotExists.
For the first run we give the db user enough rights to create and fill the database, it does this without problem.
But after the initial setup we remove those rights and the issue starts.
It tries to create the database, But it already exists.
And I am hoping there is a way to have both Automatic database creation/migration, and the View any database on deny securable.
Does anyone have a idea on how to solve this issue?
Is there some sort of option I could enable to stop this behaviour?
You should "wire in" IHostingEnvironment and make sure you run
CreateDatabaseIfNotExists and MigrateDatabaseToLatestVersion
only in certain environments.
===========
For DotNet-Core (NON asp.net-core) apps.
https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.hosting.internal.hostingenvironment?view=dotnet-plat-ext-7.0
for asp.net-core.
https://learn.microsoft.com/en-us/dotnet/api/microsoft.aspnetcore.hosting.iwebhostenvironment?view=aspnetcore-6.0
....
Then you will use (probably an existing)
"Is" method:
https://learn.microsoft.com/en-us/dotnet/api/microsoft.aspnetcore.hosting.hostingenvironmentextensions.isdevelopment?view=aspnetcore-7.0
IsDevelopment
IsProduction
IsStaging
or you have the ability to "add your own environment".. with
IsEnvironment(string)
I would NEVER leave to "auto-voodoo" what might happen to the production database.
You can see this approach:
https://stackoverflow.com/a/60399887/214977

SqlException:System.Data.SqlClient [duplicate]

I have created a web service which is saving some data into to db. But I am getting this error:
Cannot open database "test" requested by the login. The login failed. Login failed for user 'xyz\ASPNET'.
My connection string is
Data Source=.\SQLExpress;Initial Catalog=IFItest;Integrated Security=True
Well, the error is pretty clear, no? You are trying to connect to your SQL Server with user "xyz/ASPNET" - that's the account your ASP.NET app is running under.
This account is not allowed to connect to SQL Server - either create a login on SQL Server for that account, or then specify another valid SQL Server account in your connection string.
Can you show us your connection string (by updating your original question)?
UPDATE: Ok, you're using integrated Windows authentication --> you need to create a SQL Server login for "xyz\ASPNET" on your SQL Server - or change your connection string to something like:
connectionString="Server=.\SQLExpress;Database=IFItest;User ID=xyz;pwd=top$secret"
If you have a user "xyz" with a password of "top$secret" in your database.
Either: "xyz\ASPNET" is not a login (in sys.server_principals)
Or: "xyz\ASPNET" is set up but not mapped to a user in the database test (sys.database_principals)
I'd go for the 2nd option: the error message implies the default database is either not there or no rights in it, rather than not set up as a login.
To test if it's set up as a login
SELECT SUSER_ID('xyz\ASPNET') -- (**not** SUSER_SID)
If NULL
CREATE LOGIN [xyz\ASPNET] FROM WINDOWS
If not NULL
USE test
GO
SELECT USER_ID('xyz\ASPNET')
If NULL
USE test
GO
CREATE USER [xyz\ASPNET] FROM LOGIN [xyz\ASPNET]
I had this problem and what solved it for me was to:
Go to the Application pools in the IIS
Right click on my project application pool
In Process Model section open Identity
Choose Custom account option
Enter your pc user name and password.
For me the database was not created and EF code first should have created it but always endet in this error. The same connection string was working in aspnet core default web project. The solution was to add
_dbContext.Database.EnsureCreated()
before the first database contact (before DB seeding).
The best solution for the login problem is to create a login user in sqlServer. Here are the steps to create a SQL Server login that uses Windows Authentication (SQL Server Management Studio):
In SQL Server Management Studio, open Object Explorer and expand the folder of
the server instance in which to create the new login.
Right-click the Security folder, point to New, and then click Login.
On the General page, enter the name of a Windows user in the Login name box.
Select Windows Authentication.
Click OK.
For example, if the user name is xyz\ASPNET, then enter this name into Login name Box.
Also you need to change the User mapping to allow access to the Database which you want to access.
Most times, it's not a login issue, but an issue with creating the database itself. So if there is an error creating your database, it would not be created in the first place. In which case if you tried to log in, regardless of the user, login would fail. This usually happens due to logical misinterpretation of the db context.
Visit the site in a browser and REALLY read those error logs, this can help you spot the problem with you code (usually conflicting logic problems with the model).
In my case, the code compiled fine, same login problem, while I was still downloading management studio, I went through the error log, fixed my db context constraints and site started running fine....meanwhile management studio is still downloading
This Works for me.
Go to SQL Server >> Security >> Logins and right click on NT AUTHORITY\NETWORK SERVICE and select Properties
In newly opened screen of Login Properties, go to the “User Mapping” tab.
Then, on the “User Mapping” tab, select the desired database – especially the database for which this error message is displayed.
Click OK.
Read this blog.
http://blog.sqlauthority.com/2009/08/20/sql-server-fix-error-cannot-open-database-requested-by-the-login-the-login-failed-login-failed-for-user-nt-authoritynetwork-service/
It also happen when you type wrong name of DB
ex : xxx-db-dev to xxx-dev-db
Sometime, it's just a stupid mistake . I take about more than 1 hours to find out this :( because i just try alot of difficult thing first
The Issue
The error presents itself as a message similar to this:
Cannot open database "DATABASE NAME" requested by the login. The login
failed. Login failed for user XYZ.
The error cannot usually be rectified by a simple Visual Studio or full-computer restart.
The error can also be found as a seemingly locked database file.
The Fix
The solution is laid in the following steps. You will not lose any data in your database and you should not delete your database file!
Pre-requisite: You must have installed SQL Server Management Studio (Full or Express)
Open SQL Server Management Studio
In the "Connect to Server" window (File->Connect object explorer) enter the following:
Server type : Database Engine
Server name : (localdb)\v11.0
Authentication : [Whatever you used when you created your local db. Probably Windows Authentication).
Click "Connect"
Expand the "Databases" folder in the Object Explorer (View->Object Explorer, F8)
Find your database. It should be named as the full path to your database (.mdf) file
You should see it says "(Pending Recovery)" at the end of the database name or when you try to expand the database it won't be able to and may or may not give you an error message.
This the issue! Your database has crashed essentially..
Right click on the database then select "Tasks -> Detach...".
In the detach window, select your database in the list and check the column that says "Drop Connections"
Click OK.
You should see the database disappear from the list of databases. Your problem should now be fixed. Go and run your application that uses your localdb.
After running your application, your database will re-appear in the list of databases - this is correct. It should not say "Pending recovery" any more since it should be working properly.
The source of the solution: https://www.codeproject.com/Tips/775607/How-to-fix-LocalDB-Requested-Login-failed
I tried to update the user, and it worked. See the command below.
USE ComparisonData// databaseName
EXEC sp_change_users_login #Action='update_one', #UserNamePattern='ftool',#LoginName='ftool';
Just replace user('ftool') accordingly.
I had this problem when I created a WPF .NET Core + Entity Framework Core project and then cloning it on a a new laptop.
Using:
update-database
in the package manager console simply solved it.
To open package manager console go to:
Tools-> Nuget Package Manager -> Package Manager console
I used Windows authentication to connect to local database .mdf file and
my local server was sql server 2014.
My problem solved using this connection string:
string sqlString = " Data Source = (LocalDB)\\MSSQLLocalDB;" + "AttachDbFilename = F:\\.........\\myDatabase.mdf; Integrated Security = True; Connect Timeout = 30";
In my case it is a different issue. The database turned into single user mode and a second connection to the database was showing this exception.
To resolve this issue follow below steps.
Make sure the object explorer is pointed to a system database like master.
Execute a exec sp_who2 and find all the connections to database ‘my_db’. Kill all the connections by doing KILL { session id } where session id is the SPID listed by sp_who2.
USE MASTER;
EXEC sp_who2
Alter the database
USE MASTER;
ALTER DATABASE [my_db] SET MULTI_USER
GO
I ran into this issue when attempting to write to the default database provided in the asp.net mvc template. This was due to the fact that the database hadn't been created yet.
To create the database and make sure that it is accessible follow these steps:
Open up the Package manager console in Visual Studio
Run the command "update-database"
This will create the database an run all the necessary migrations on it.
I have not seen this mentioned in the previous issues, so let me throw out another possibility. It could be that IFItest is not reachable or simply does not exist. For example, if one has a number of configurations, each with its own database, it could be that the database name was not changed to the correct one for the current configuration.
NB: If using a windows service to host the webservice.
You have to insure that your webservice is using the right Log on account to connect to SQL Server.
Open services(I assume the windows service has been install)
Right click on the service and goto properties.
Click on "Log On" Tab
Click on "This account" radio button
Click "Browse"
Enter Pc user name in Text Field and click "Check Name" Button to the right.
Click on text in Text Field, press "OK" button
enter login password and Apply
Inspired by cyptus's answer I used
_dbContext.Database.CreateIfNotExists();
on EF6 before the first database contact (before DB seeding).
If you haven't created the database in your server you will get the same login error.Make sure that the database exist before you login.
it's not a login issue most times. The database might not have been created. To create the database, Go to db context file and add this.Database.EnsureCreated();
The best option would be to use Windows integrated authentication as it is more secure than sql authentication. Create a new windows user in sql server with necessary permissions and change IIS user in the application pool security settings.
I found that I also had to set the UserMapping option when creating a new login and this solved the problem for me. Hope that helps anyone that also found themselves stuck here!
Edit: Setting the login as db owner solved the next problem, too
Some times this trouble may appear if you open this db in another sql server (as example, you launch sql managment studio(SMS) and add this db), and forget stop this server. As result - you app try to connect with user already connected in this db under another server. To fix that, try stop this server by Config. dispatcher sql server.
My apologies about bad english.
Kind regards, Ignat.
In my case the asp.net application can usually connect to database without any problems. I noticed such message in logs. I turn on the SQL server logs and I find out this message:
2016-10-28 10:27:10.86 Logon Login failed for user '****'. Reason: Failed to open the explicitly specified database '****'. [CLIENT: <local machine>]
2016-10-28 10:27:13.22 Server SQL Server is terminating because of a system shutdown. This is an informational message only. No user action is required.
So it seems that server was restarting and that SQL server whad been shutting down a bit earlier then ASP.NET application and the database was not available for few seconds before server restart.
Even if you've set the login as DB owner and set the user mapping for the database that will use the login, check that the actual DB user (not just the login) has the role of 'owner'.
In my case, I was running a Windows Service under "System" identity. The error was:
System.Data.SqlClient.SqlException (0x80131904):
Cannot open database "MyDbName" requested by the login. The login failed.
Login failed for user 'MYDOMAINNAME\HOSTNAME$'.
The problem is that the error is very misleading. Even after I added 'MYDOMAINNAME\HOSTNAME$' login to the database, and granted this login sysadmin access and added a user for that login on my target database, and made that user dbowner, I was still getting the same error.
Apparently I needed to do the same for 'NT AUTHORITY\SYSTEM' login. After I did that, I was able to login without a problem. I don't know why the error message complains about 'MYDOMAINNAME\HOSTNAME$'. I deleted that login and the corresponding user and everything still works.
When using EF Code First, make sure the database exists. You could run the update-database command first.
If none of the above solution is working.
I encountered with the same error message but my issue was completely different. I had just restore my database and the database was in restoring mode. So if your database is in rstoring mode just apply following query.
RESTORE DATABASE MyDatabase
FROM DISK = 'pathToYourDbBackup\MyDatabase.bak'
WITH REPLACE,RECOVERY
I had this happen to me when I deleted the DB and forgot to recreate it. It happens sometimes, since Database folder needs refresh.
If you didn't have any problems before and you get this error only in the package manager console, you don't need to do anything special. Just open the sql server object explorer window and connect and run the command again in the console.

Error in trying to create new Firebird user using Firebird client in C#

I'm trying to create new DB user for Firebird 2.5 DB from my C# application and geting an error "add record error no permission for insert/write access to TABLE USERS".
I've granted rdb$admin role to the user, created connection to DB using this role yet still i'm getting this error.
Wierdiest thing for me is that when i'm trying to create new user for my DB in IBExpert using same user settings and role (rdb$admin) it goes fine and I don't get eny errors.
What could be the problem? Why can't I execute SQL queries and procedures that update/insert in USERS table although I have appropriate role, that I'm using establishing connection?
I'm using latest FirebirdClient - ADO.NET Data Provider.
Connection string to the DB looks like this:
`"User=developer;Password=*****;Database=C:\DB.fdb;DataSource=*****;Port=*****;Dialect=3;Charset=NONE;Role=rdb$admin;Connection lifetime=15;Pooling=True;MinPoolSize=0;MaxPoolSize=50;Packet Size=8192;ServerType=0;"`
Can somebody help me with this problem?
I've found a solution - problem was that I forgot to GRANT ADMIN ROLE to the user by which I've executed procedure so I can't manage database users.
So GRANT ADMIN ROLE to user solved the problem.

sql server creation of logins and users by another user

I am using SQL Server Express 2005.
I have a single database myDB
I have created a Login L-1 with user U-1 on databas myDB.
To connect to database myDB I found 3 ways:
-1(a)-after creating L-1 Login with default database = myDB , I have to create a user U-1 , and when I connected to SQL server , then it connected.
I used this query:
create login L-1 with password='passL1' , default_database = myDB
use myDB
create user U-1 for login L-1
Means, creating a user inside a login , gives the user connect permission implicitly. Am I right ?
-1(b)-I didn't create any user U-1, but executed this :
use myDB
sp_grantdbaccess L-1
this also made me connect , the reason being that, sql added a user named L-1 implicitly in the myDB database. Am I right?
-1(c)-this time also, I didn't create any user U-1,but I executed this:
sp_changedbowner L-1
this also made me connect , the reason being that, sql added a user named L-1 implicitly in the myDB database. Am I right?
Now, I want to give the user U-1 created in 1(a) the following permissions:
Create Logins L-2,L-3
Create Users U2,U3 which can also connect to database myDB.
How do I do this?
Yes - calling sp_grantdbaccess or sp_changedbowner will just implicitly do what you would normally do with CREATE USER - no difference.
Calling CREATE USER explicitly is just clearer, more obvious what you're doing etc.
Also: don't use sp_grantdbaccess anymore - because:
This feature will be removed in a
future version of Microsoft SQL
Server. Avoid using this feature in
new development work, and plan to
modify applications that currently use
this feature. Use CREATE USER instead.
Source: Technet on sp_Grantdbaccess
And don't use sp_changedbowner either - same reason:
This feature will be removed in a
future version of Microsoft SQL
Server. Avoid using this feature in
new development work, and plan to
modify applications that currently use
this feature. Use ALTER AUTHORIZATION
instead.
Source: Technet on sp_changedbower

Cannot open database "test" requested by the login. The login failed. Login failed for user 'xyz\ASPNET'

I have created a web service which is saving some data into to db. But I am getting this error:
Cannot open database "test" requested by the login. The login failed. Login failed for user 'xyz\ASPNET'.
My connection string is
Data Source=.\SQLExpress;Initial Catalog=IFItest;Integrated Security=True
Well, the error is pretty clear, no? You are trying to connect to your SQL Server with user "xyz/ASPNET" - that's the account your ASP.NET app is running under.
This account is not allowed to connect to SQL Server - either create a login on SQL Server for that account, or then specify another valid SQL Server account in your connection string.
Can you show us your connection string (by updating your original question)?
UPDATE: Ok, you're using integrated Windows authentication --> you need to create a SQL Server login for "xyz\ASPNET" on your SQL Server - or change your connection string to something like:
connectionString="Server=.\SQLExpress;Database=IFItest;User ID=xyz;pwd=top$secret"
If you have a user "xyz" with a password of "top$secret" in your database.
Either: "xyz\ASPNET" is not a login (in sys.server_principals)
Or: "xyz\ASPNET" is set up but not mapped to a user in the database test (sys.database_principals)
I'd go for the 2nd option: the error message implies the default database is either not there or no rights in it, rather than not set up as a login.
To test if it's set up as a login
SELECT SUSER_ID('xyz\ASPNET') -- (**not** SUSER_SID)
If NULL
CREATE LOGIN [xyz\ASPNET] FROM WINDOWS
If not NULL
USE test
GO
SELECT USER_ID('xyz\ASPNET')
If NULL
USE test
GO
CREATE USER [xyz\ASPNET] FROM LOGIN [xyz\ASPNET]
I had this problem and what solved it for me was to:
Go to the Application pools in the IIS
Right click on my project application pool
In Process Model section open Identity
Choose Custom account option
Enter your pc user name and password.
For me the database was not created and EF code first should have created it but always endet in this error. The same connection string was working in aspnet core default web project. The solution was to add
_dbContext.Database.EnsureCreated()
before the first database contact (before DB seeding).
The best solution for the login problem is to create a login user in sqlServer. Here are the steps to create a SQL Server login that uses Windows Authentication (SQL Server Management Studio):
In SQL Server Management Studio, open Object Explorer and expand the folder of
the server instance in which to create the new login.
Right-click the Security folder, point to New, and then click Login.
On the General page, enter the name of a Windows user in the Login name box.
Select Windows Authentication.
Click OK.
For example, if the user name is xyz\ASPNET, then enter this name into Login name Box.
Also you need to change the User mapping to allow access to the Database which you want to access.
Most times, it's not a login issue, but an issue with creating the database itself. So if there is an error creating your database, it would not be created in the first place. In which case if you tried to log in, regardless of the user, login would fail. This usually happens due to logical misinterpretation of the db context.
Visit the site in a browser and REALLY read those error logs, this can help you spot the problem with you code (usually conflicting logic problems with the model).
In my case, the code compiled fine, same login problem, while I was still downloading management studio, I went through the error log, fixed my db context constraints and site started running fine....meanwhile management studio is still downloading
This Works for me.
Go to SQL Server >> Security >> Logins and right click on NT AUTHORITY\NETWORK SERVICE and select Properties
In newly opened screen of Login Properties, go to the “User Mapping” tab.
Then, on the “User Mapping” tab, select the desired database – especially the database for which this error message is displayed.
Click OK.
Read this blog.
http://blog.sqlauthority.com/2009/08/20/sql-server-fix-error-cannot-open-database-requested-by-the-login-the-login-failed-login-failed-for-user-nt-authoritynetwork-service/
It also happen when you type wrong name of DB
ex : xxx-db-dev to xxx-dev-db
Sometime, it's just a stupid mistake . I take about more than 1 hours to find out this :( because i just try alot of difficult thing first
The Issue
The error presents itself as a message similar to this:
Cannot open database "DATABASE NAME" requested by the login. The login
failed. Login failed for user XYZ.
The error cannot usually be rectified by a simple Visual Studio or full-computer restart.
The error can also be found as a seemingly locked database file.
The Fix
The solution is laid in the following steps. You will not lose any data in your database and you should not delete your database file!
Pre-requisite: You must have installed SQL Server Management Studio (Full or Express)
Open SQL Server Management Studio
In the "Connect to Server" window (File->Connect object explorer) enter the following:
Server type : Database Engine
Server name : (localdb)\v11.0
Authentication : [Whatever you used when you created your local db. Probably Windows Authentication).
Click "Connect"
Expand the "Databases" folder in the Object Explorer (View->Object Explorer, F8)
Find your database. It should be named as the full path to your database (.mdf) file
You should see it says "(Pending Recovery)" at the end of the database name or when you try to expand the database it won't be able to and may or may not give you an error message.
This the issue! Your database has crashed essentially..
Right click on the database then select "Tasks -> Detach...".
In the detach window, select your database in the list and check the column that says "Drop Connections"
Click OK.
You should see the database disappear from the list of databases. Your problem should now be fixed. Go and run your application that uses your localdb.
After running your application, your database will re-appear in the list of databases - this is correct. It should not say "Pending recovery" any more since it should be working properly.
The source of the solution: https://www.codeproject.com/Tips/775607/How-to-fix-LocalDB-Requested-Login-failed
I tried to update the user, and it worked. See the command below.
USE ComparisonData// databaseName
EXEC sp_change_users_login #Action='update_one', #UserNamePattern='ftool',#LoginName='ftool';
Just replace user('ftool') accordingly.
I had this problem when I created a WPF .NET Core + Entity Framework Core project and then cloning it on a a new laptop.
Using:
update-database
in the package manager console simply solved it.
To open package manager console go to:
Tools-> Nuget Package Manager -> Package Manager console
I used Windows authentication to connect to local database .mdf file and
my local server was sql server 2014.
My problem solved using this connection string:
string sqlString = " Data Source = (LocalDB)\\MSSQLLocalDB;" + "AttachDbFilename = F:\\.........\\myDatabase.mdf; Integrated Security = True; Connect Timeout = 30";
In my case it is a different issue. The database turned into single user mode and a second connection to the database was showing this exception.
To resolve this issue follow below steps.
Make sure the object explorer is pointed to a system database like master.
Execute a exec sp_who2 and find all the connections to database ‘my_db’. Kill all the connections by doing KILL { session id } where session id is the SPID listed by sp_who2.
USE MASTER;
EXEC sp_who2
Alter the database
USE MASTER;
ALTER DATABASE [my_db] SET MULTI_USER
GO
I ran into this issue when attempting to write to the default database provided in the asp.net mvc template. This was due to the fact that the database hadn't been created yet.
To create the database and make sure that it is accessible follow these steps:
Open up the Package manager console in Visual Studio
Run the command "update-database"
This will create the database an run all the necessary migrations on it.
I have not seen this mentioned in the previous issues, so let me throw out another possibility. It could be that IFItest is not reachable or simply does not exist. For example, if one has a number of configurations, each with its own database, it could be that the database name was not changed to the correct one for the current configuration.
NB: If using a windows service to host the webservice.
You have to insure that your webservice is using the right Log on account to connect to SQL Server.
Open services(I assume the windows service has been install)
Right click on the service and goto properties.
Click on "Log On" Tab
Click on "This account" radio button
Click "Browse"
Enter Pc user name in Text Field and click "Check Name" Button to the right.
Click on text in Text Field, press "OK" button
enter login password and Apply
Inspired by cyptus's answer I used
_dbContext.Database.CreateIfNotExists();
on EF6 before the first database contact (before DB seeding).
If you haven't created the database in your server you will get the same login error.Make sure that the database exist before you login.
it's not a login issue most times. The database might not have been created. To create the database, Go to db context file and add this.Database.EnsureCreated();
The best option would be to use Windows integrated authentication as it is more secure than sql authentication. Create a new windows user in sql server with necessary permissions and change IIS user in the application pool security settings.
I found that I also had to set the UserMapping option when creating a new login and this solved the problem for me. Hope that helps anyone that also found themselves stuck here!
Edit: Setting the login as db owner solved the next problem, too
Some times this trouble may appear if you open this db in another sql server (as example, you launch sql managment studio(SMS) and add this db), and forget stop this server. As result - you app try to connect with user already connected in this db under another server. To fix that, try stop this server by Config. dispatcher sql server.
My apologies about bad english.
Kind regards, Ignat.
In my case the asp.net application can usually connect to database without any problems. I noticed such message in logs. I turn on the SQL server logs and I find out this message:
2016-10-28 10:27:10.86 Logon Login failed for user '****'. Reason: Failed to open the explicitly specified database '****'. [CLIENT: <local machine>]
2016-10-28 10:27:13.22 Server SQL Server is terminating because of a system shutdown. This is an informational message only. No user action is required.
So it seems that server was restarting and that SQL server whad been shutting down a bit earlier then ASP.NET application and the database was not available for few seconds before server restart.
Even if you've set the login as DB owner and set the user mapping for the database that will use the login, check that the actual DB user (not just the login) has the role of 'owner'.
In my case, I was running a Windows Service under "System" identity. The error was:
System.Data.SqlClient.SqlException (0x80131904):
Cannot open database "MyDbName" requested by the login. The login failed.
Login failed for user 'MYDOMAINNAME\HOSTNAME$'.
The problem is that the error is very misleading. Even after I added 'MYDOMAINNAME\HOSTNAME$' login to the database, and granted this login sysadmin access and added a user for that login on my target database, and made that user dbowner, I was still getting the same error.
Apparently I needed to do the same for 'NT AUTHORITY\SYSTEM' login. After I did that, I was able to login without a problem. I don't know why the error message complains about 'MYDOMAINNAME\HOSTNAME$'. I deleted that login and the corresponding user and everything still works.
When using EF Code First, make sure the database exists. You could run the update-database command first.
If none of the above solution is working.
I encountered with the same error message but my issue was completely different. I had just restore my database and the database was in restoring mode. So if your database is in rstoring mode just apply following query.
RESTORE DATABASE MyDatabase
FROM DISK = 'pathToYourDbBackup\MyDatabase.bak'
WITH REPLACE,RECOVERY
I had this happen to me when I deleted the DB and forgot to recreate it. It happens sometimes, since Database folder needs refresh.
If you didn't have any problems before and you get this error only in the package manager console, you don't need to do anything special. Just open the sql server object explorer window and connect and run the command again in the console.

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