I have a WinForms program I am creating for a friend of mine that uses a SQL Server Express database. Locally, I can connect to my SQL Server Express fine and when I deploy the app to his computer, it works also. I'm having difficulty connecting to his SQL Server Express instance from my machine though (I'm trying to run the program in debug mode in vs2012 but connected to his database). The program uses Entity Framework in case that matters (I don't think it does).
We've setup his firewall to allow my IP address to access his computer and his SQL Server... so I can log in via remote desktop and I can also connect using SSMS from my pc and see all the databases.... but why can't I connect using vs2012? I'm thinking it has something to do with the connection string but haven't found a working solution yet.
Here's what I have tried:
Got these from ConnectionStrings.com:
Server=100.100.100.100\SQLExpress;Database=TestDB;User Id=UserID;Password=myPassword;
DataSource=100.100.100.100\SQLExpress;Database=TestDB;User Id=UserID;Password=myPassword;
Obviously the IP address has changed for the purposes of this post.
Any ideas?
You've used the connection string attribute:
DataSource
There is no such thing, and I suspect it was just a typo (it pays to use cut and paste instead of transcribing). There is actually a space in that attribute, so it should be:
Data Source
Here is a list of things you need to check on the other computer:
Is TCP/IP protocol enabled? Go to SQL Server Configuration Manager -> SQL Server Network Configuration -> Protocols for {instance}
What IP addresses are enabled for listening in configuration manager? Go to TCP/IP properties -> IP Addresses tab
SQL Server browser started
Firewall set properly – you want to enable TCP and UDP traffic on port 1433
Server allows remote connections? In SSMS open properties for that instance and check Connections tab.
Related
I have created a simple login application using the C#.net. I have some basic sql database(I use SSMS). There is name, email and password. I want my application to be usable from more devices (so I can't use localdb). Everything works fine on my pc but when I move to another, where is not installed ssms it shows error 26 - Error Locating Server/Instance Specified. I don't know how exactly to run my C# application without SQL Server Management Studio installed on client machine
I have researched for a weeks so I enable tcp/ip (from sql server manager), also add new inbound rules for tcp(1433) and udp(1434) ports in windows firewall. After that I allow remote connection and add sql server in windows firewall. Also I've tried to install SSMS on client machine but nothing
here are my conncetion strings
this one I tried to solve my problem
Data Source=xxxxxxxxxxxx;Initial Catalog=xxxxxxxxxxx;Integrated Security=SSPI
the other one is my main connection string
Data Source=xxxxxxxxxxxxxxxxxxxxxxx;Initial Catalog=xxxxxxxxxxxxxx;Integrated
Integrated Security = True
The application works fine on my computer, I've installed Visual Studio 2017 and SQL Server Management studio, but when I move to another computer it doesn't work.
Thanks to everyone in advance!!
SSMS is just a Database Management Tool, the actual Database would by SQLExpress or similar. So on your remote host you need to install the latter and set it up correctly in you application to use to appropiate connectionstring to it.
Schema compare your tables from VS and your ready to go.
https://www.microsoft.com/en-us/sql-server/sql-server-editions-express
https://www.mssqltips.com/sqlservertip/5528/installing-sql-server-2017-express/
You dont need to install sql or sql managemment studio in pc where you running your application, but just as your error said "Error Locating Server/Instance Specified", the server where you want to connect, is not accesible, thats means you should open your ports in pc where your sql server is hosted, and also, put your public ip following with that port in your server name in conectionstring, like Data Source=yourserver_IP:8076; tip: make sure your app pc and server pc are in same network.
The reason it works on the same machine is most likely is is that when you go through another machine the connection has to go through a firewall that is blocking access to SQL Server. The default port that SQL Server uses is 1433 and unless you change it on the host machine when you connect from another machine that is the port that is use to connect and you don't have to specify the port. When you connect on the same machine that SQL Server is installed the firewall does not prevent you from connecting. Port 1433 is used for the default instance (The first installed instance on the machine).
I created a very simple application just to test out if I could create an app and then put it on another computer and hit the database on my other computer. I can enter data into my database on the computer that hosts the SQL Server just fine, but on my other computer I get the error message
Provider: Named pipes Provider, Error 40, could not open a connection to SQL Server
I've done everything on this link and googled and tried troubleshooting a ton. I am using SQL Server 2017 and VS 2017. Is it something wrong with the host computer or the other computer?
I tried troubleshooting with this link and after I got to the part about pinging the computer I can't ping the host computer using the other computer and using the other computer I can't ping the host computer. Both ways pinging wouldn't work, but the information on how to troubleshoot that wasn't very good.
I found something may be helpful from google...
According to users, if you're unable to ping other computers, the issue might be related to your network. To fix the problem, be sure that your PCs are properly connected and able to access the Internet. In addition, you might want to try restarting your network devices and check if that solves the issue
https://windowsreport.com/windows-10-unable-to-ping-other-computers/
For this you need to:
1. Enable access through firewall
2. Specify a port to connect to the computer hosting the database.
3. Make sure you are on the same network and can connect each other via localhost. If you cannot access via the default 127.0.0.1, try connecting by the ip address of the computer that is hosting your database.
If proper firewall access and ip config are not maintained, you will not be able to connect to the DB. It is appropriate running a REST server configuration on the host machine to allow access to the data through API requests rather than direct access to the SQL database.
Hi,
I had same problem while connecting sql server via developement
server.
In my case there was a problem with sql port (1433) blocked from
firewall.
Please do below given steps to check the same in your machine.
I hope it will work for u.
1 > open cmd and ping your server IP
for example
c:\System32>ping 192.168.1.45 -t
2> check sql port(1433) is open for your sql sever by using telnet
for example : telnet server IP port Number
c:\System32> telnet 192.168.1.45 1433
3 > if telenet failed... then use below command to open the port OR
contact your network team.
c:\System32> netsh firewall set portopening protocol = TCP port = 1433 name =
SQLPort mode = ENABLE scope = SUBNET profile = CURRENT
I have built a winforms application which is installed on client machines with an SQL Server Database hosted on a server which clients access via remote connection.
The application works as planned on the server and one client but when I try o access the same data from a second client I get a "pre-login handshake" error.
On researching I found a number of solutions, some stating that I needed to enable IPV4 and IPV6 which I did, others stating that I needed to enable remote connection which was not the problem as the other client already accesses it.
Can anyone give me any pointers as to what the problem might be?
The client that works runs: 64 bit processor, Windows 8 OS.
The client that doesn't runs: 32 bit processor, Windows Vista.
Clents also access the app via ClickOnce over a local network.
Application target OS is currently set to x64.
I will switch to any CPU and x86 and report if there are any changes when I get to the office.
Check the network
The fact that your x64 box can see the server but your 32-bit box can't is odd. Are both boxes attached to the same switch or do they reach the server via different network paths? As Eric stated, there may be firewalls blocking the SQL Server port between the 32-bit machine and the SQL box.
Also, from the failing machine, check what network address it thinks the SQL Box lives at:
C:\> nslookup TestSQLServer
Server: dns1.internal.foo.com
Address: 10.1.10.2
Non-authoritative answer:
Name: TestSQLServer
Address: 10.1.10.141
If your DNS returns an IPv6 address for your SQL box, be sure the failing client has IPv6 installed and enabled.
Check your SQL Server
As discussed in this thread, try setting your SQL Server to listen to a specific network interface and try connecting to that interface's IP address. NB: Do NOT hard-code your client code to talk to this IP address if it's dynamically allocated via DHCP.
Also check which port your server is listening on - if its been changed from the default, you'll have to specify the port number in the client's connection string/code.
Check your connection to SQL Server
I recommend thoroughly testing the network between your failing client and the server.
Test that your failing client can see the SQL Server on the network
Use the "ODBC Data Sources" control panel applet to create an ODBC connection to the SQL Server from the failing client. Use the "Test Data Source" button
Test that you can connect to the SQL Server from the failing client using SQLCMD. Be sure to connect using the same credentials that your client uses to login to SQL Server E.g:
sqlcmd -S TestSQLServer\TestInstance1 -D TestDB -U TestUser -P TestPassword -Q select * from TestData
I just downloaded the latest version of SQL Express 2012 but I cannot connect to localhost. I tried localhost\SQLExpress and Windows authentication but it gives me an error message saying cannot connect. Am I missing something here? I've used SQL Server 2008 before and I've never had issues connecting to localhost. It seems that it can't even find it. Also in the Services I only see a SQL Server VSS Writer. Is this the way it should be? Or am I missing something? Thanks
According to Aaron Bertand:
You need to verify that the SQL Server service is running. You can do this by going to Start > Control Panel > Administrative Tools > Services, and checking that the service SQL Server (SQLEXPRESS) is running. If not, start it.
While you're in the services applet, also make sure that the service SQL Browser is started. If not, start it.
You need to make sure that SQL Server is allowed to use TCP/IP or named pipes. You can turn these on by opening the SQL Server Configuration Manager in Start > Programs > Microsoft SQL Server 2012 > Configuration Tools (or SQL Server Configuration Manager), and make sure that TCP/IP and Named Pipes are enabled. If you don't find the SQL Server Configuration Manager in the Start Menu you can launch the MMC snap-in manually. Check SQL Server Configuration Manager for the path to the snap-in according to your version.
Verify your SQL Server connection authentication mode matches your connection string:
If you're connecting using a username and password, you need to configure SQL Server to accept "SQL Server Authentication Mode":
-- YOU MUST RESTART YOUR SQL SERVER AFTER RUNNING THIS!
USE [master]
GO
DECLARE #SqlServerAndWindowsAuthenticationMode INT = 2;
EXEC xp_instance_regwrite
N'HKEY_LOCAL_MACHINE',
N'Software\Microsoft\MSSQLServer\MSSQLServer',
N'LoginMode',
REG_DWORD,
#SqlServerAndWindowsAuthenticationMode;
GO
If you're connecting using "Integrated Security=true" (Windows Mode), and this error only comes up when debugging in web applications, then you need to add the ApplicationPoolIdentity as a SQL Server login:
otherwise, run Start -> Run -> Services.msc If so, is it running?
If it's not running then
It sounds like you didn't get everything installed. Launch the install file and chose the option "New installation or add features to an existing installation". From there you should be able to make sure the database engine service gets installed.
Goto Start -> Programs -> Microsoft SQL ServerYYYY -> Configuration Tools -> SQL Server YYYY Configuration Manager or run "SQLServerManager12.msc".
Make sure that TCP/IP is enabled under Client Protocols.
Then go into "SQL Server Network Configuration" and double click TCP/IP. Click the "IP Addresses" tab and scroll to the bottom. Under "IP All" remove TCP Dynamic Ports if it is present and set TCP Port to 1433. Click OK and then go back to "SQL Server Services" and restart SQL Server instance. Now you can connect via localhost, at least I could.
Note that this error can of course occur when connecting from other applications as well. Example for a normal C# web application Web.config connection string:
<connectionStrings>
<add name="DefaultConnection" connectionString="server=localhost;database=myDb;uid=myUser;password=myPass;" />
</connectionStrings>
in SQL SERVER EXPRESS 2012 you should use "(localdb)\MSSQLLocalDB" as Data Source name
for example you can use connection string like this
Data Source=(localdb)\MSSQLLocalDB;Initial Catalog=master;Integrated Security=True;
First try the most popular solution provided by Ravindra Bagale.
If your connection from localhost to the database still fails with error similar to the following:
Can't connect to SQL Server DB. Error: The TCP/IP connection to the host [IP address], port 1433 has failed. Error: "Connection refused: connect. Verify the connection properties. Make sure that an instance of SQL Server is running on the host and accepting TCP/IP connections at the port. Make sure that TCP connections to the port are not blocked by a firewall."
Open the SQL Server Configuration Manager.
Expand SQL Server Network Configuration for the server instance in question.
Double-click "TCP/IP".
Under the "Protocol" section, set "Enabled" to "Yes".
Under the "IP Addresses" section, set the TCP port under "IP All" (which is 1433 by default).
Under the "IP Addresses" section, find subsections with IP address 127.0.0.1 (for IPv4) and ::1 (for IPv6) and set both "Enabled" and "Active" to "Yes", and TCP port to 1433.
Go to Start > Control Panel > Administrative Tools > Services, and restart the SQL Server service (SQLEXPRESS).
I had a similar problem - maybe my solution will help. I just installed MSSQL EX 2012 (default install) and tried to connect with VS2012 EX. No joy. I then looked at the services, confirmed that SQL Server (SQLEXPRESS) was, indeed running.
However, I saw another interesting service called SQL Server Browser that was disabled. I enabled it, fired it and was then able to retrieve the server name in a new connection in VS2012 EX and connect.
Odd that they would disable a service required for VS to connect.
First check SQL Server Service is Running or stopped, if it is stopped just start it, to do so..just follow the below steps.
1.Start -> Run ->Services.msc
Go to Standard tab in services panel then search for SQl Server(SQL2014)
"SQL2014" is given By me, it may be Another Name in your case
that's it once you start the SQL Service, you are able to connect local database.
hope it will help someone.
All my services were running as expected, and I still couldn't connect.
I had to update the TCP/IP properties section in the SQL Server Configuration Manager for my SQL Server Express protocols, and set the IPALL port to 1433 in order to connect to the server as expected.
After doing the steps which were mentioned by #Ravindra Bagale,
Try this step.
Server name: localhost\{Instance name you were gave}
Try changing from windows authentication to mixed mode
The problem for me was that I was not specifying .\. I was only specifying the name of the instance:
did not work: SQL2016
worked: .\SQL2016
This is odd I have a similar problem. I downloaded the package for SQL 2012 Express with Tools but the Database Engine was not install.
I donloaded the other one from the MS site and this one installed the database engine. After a reboot the services were listed and ready to go.
My situation
empty Instance Name in SQL Server Management Studio > select your database engine > Right Mouse Button > Properties (Server Properties) > Link View connection properties > Product > Instance Name is empty
Data Source=.\SQLEXPRESS did not work => use localhost in web.config (see below)
Solution: in web.config
xxxxxx = name of my database without .mdf
yyyyyy = name of my database in VS2012 database explorer
You can force the use of TCP instead of shared memory, either by prefixing tcp: to the server name in the connection string, or by using localhost.
http://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqlconnection.connectionstring%28v=vs.110%29.aspx
I had the same issue and I found that this happened after I installed an update for my SQL 2012. What fixed it for me was going into programs and features and running a repair on it.
Try changing the User that owns the service to Local System or use your admin account.
Under services, I changed the Service SQL Server (MSSQLSERVER) Log On from NT Service\Sql... To Local System. Right click the service and go to the Log On Tab and select the radio button Local System Account. You could also force another User to run it too if that fits better.
I am pretty new to SQL and I'm stuck on something which is probably a few clicks away.
The program I am building will store the data in the database created on the management studio. Everything works fine on a test application. Now the question is: how should I connect to the database if I want to open the program from another computer? I tried copying the test project on a friend's computer but it cannot find the database as I suppose is obvious because the db is stored on my pc.
i know hundreds of questions like this exist around google but I'm sick of looking at forums reading complicated stuff. any help will be really appreciated.
thanks.
In the database connection settings or script you propably have database server set to 'localhost'
Try setting this to the computer network IP if the other computer is inside the same network.
To connect to it from outside the network (over the internet) You need set the database server setting to you external IP and you have to port-forward (NAT) the SQL server port to your computer.
If you can tell us what database software you are using for the Database I can tell you what port to forward, for more help with forwarding you should ask on serverfault.com and also provide your router/firwall make and model
It depends (at least partly) on how you're connecting to the database in the first place. Normally, you'll have some sort of connection string that tells what computer to connect to. It'll be set to the local computer by default, but changing it to something else is normally just a matter of editing that machine name into the string.
If you're connecting via ODBC, the program will just specify an ODBC connection, and the ODBC connection will specify the machine to connect to. You can use the "Data Sources (ODBC)" control panel to edit these (depending on the version of Windows you're using, it may be in the "Administrative Tools" folder instead of showing up directly in the control panel).
when you want to connect to a sql server over the network there are a few things you should know/check:
is your connection string correct (not localhost)
does the remote sql server accept tcp/ip connections
does the firewall of the remote compture allow the connection
Is the sqlbrowser running on the remote computer (if not you need to specify the port in your connection string.
To make sure this al works the best thing you can do is try to connect from the new pc to the remote database using sql management studio or if you don't want to install the ssms you can try to create an odbc profile that connects to the remote pc. By doing this you can determine if the problem is with the database itself or with your application.