I am unable to connect to XAMPP localhost in my C# Windows form application.
My code is:
SqlConnection connection = null;
try
{
connection = new SqlConnection("user id=root;" +
"password=12345678;" + "server=localhost");
connection.Open();
}
catch (Exception exptn)
{
MessageBox.Show(exptn.ToString());
}
I made sure to include "using System.Data.SqlClient;" so that my code runs. The timeout error I get at runtime is:
"System.Data.SqlClient.SqlException (0x80131904): A network-related or
instance-specific error occurred while establishing a connection to
SQL server. The server was not found or was not accessible. Verify
that the instance name is correct and that SQL server is configured to
allow remote connections."
There was more to the error message, but it was uncopyable and too long to post here. I have tried to install MySql and the .NET MySql connector separately from XAMPP. I added MySql.Data as a reference in Solution Explorer (My research told me to add MySql.Data and MySql.Web, and MySql.Data was the only one listed in the options.). Another source told me to add a Microsoft ODBC Data Source in Server/Database explorer, but the option was not available in Database Explorer. I have made sure XAMPP is running and working properly in phpMyAdmin, and I am able to create tables and run queries there. Many sources also seem to have different opinions as to what is needed in the connection string.
I am completely at a loss as to how I am supposed to connect to localhost databases from another application on the same computer. Forgive me if I am overlooking something basic or if this is a noob question, but I know little about connecting to databases (this type of thing is precisely the reason why). Can anyone help me connect to XAMPP localhost from C#?
Install MySQL Connector from Oracle and then use class MySqlConnection.
Here is the download link -
http://www.mysql.com/products/connector/
Download the driver for ADO.Net and the documentation to use it is here -
http://dev.mysql.com/doc/connector-net/en/connector-net-introduction.html
SqlConnection is for MQ SQL server only and thus it is looking for a instance of MS SQL Server to connect to and it fails to connect since none exists. This explains the error message.
Related
I have successfully created an Hybrid Connection between Azure and an on-premise resource. I see "Connected" in both the Azure Portal and Hybrid Connection Manager.
When I run my .NET code local in Visual Studio with the connection string "AppServer://MyPC:5162/AzureOeApi" everything runs fine but when I run it in Azure, I get a connection error (it can't see the on-prem end-point).
Do I need to change my connection string when running in Azure to force it to go through the Hybrid Connection or will it be handled automatically?
No need to change connection string.
We had similar issue - connection was "Connected", but no requests whould go through. You need to use fully qualified domain name in configuration of hybrid connection.
Please also read this question - similar question
I've been struggling with this problem for a whole day and finally I had a breakthrough: in my original connection string I was referring to [DB_SERVER]\[INSTANCE], having correctly configured the DB instance to listen to a given TCP port [PORT].
With this setup the Hybrid Connection was 'Connected' but I was getting the exception:
ExceptionMessage: The underlying provider failed on Open. -InnerExceptionMessage: A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)
It turns out that the connection string needs do explicitly refer to the port number (instead of the DB instance) using the syntax [DB_SERVER],[PORT] (mind the comma!).
Unfortunately Microsoft does not document this subtle detail....
I am getting the below error when I try to connect to SQL server from C# code
A network-related or instance-specific error occurred while
establishing a connection to SQL Server. The server was not found or
was not accessible. Verify that the instance name is correct and that
SQL Server is configured to allow remote connections. (provider: SQL
Network Interfaces, error: 26 - Error Locating Server/Instance
Specified)
My connection String looks like this
"Data Source={DatabaseServer};Initial
Catalog={DatabaseName};Integrated Security=SSPI;Enlist=false;"
I have tried all the option which I found in lots of articles but could not solve the issue. One more thing to note is my colleague is able to run the same code from his machine. So it is obviously not problem with SQL server. It has to do something with my machine.can anyone give me any pointers what could be the problem? I am able to connect to SQL server instance through SSMS.
What is the provider in your connection string? Something like
Data Source=SQLServerName;Initial Catalog=DatabaseName;Provider=SQLNCLI11.1;Integrated Security=SSPI;
Well I figured it out...Actually I am working on a remote machine and I created a new project in visual studio which gets created in remote drive by default. so it does not seems to find instance from remote drive but it works when I copy it to my local drive..
Since you can connect to your SQL server through SSMS and the error message looks like the connection string is wrong (or only working for some people somehow), you could compare the parameters SSMS uses in the connection dialog to those in your connection string in the C# code.
If you find any differences there, they could be the error you're looking for.
I cannot connect to a particular SQL Server 2008 database server from C#.
I am able to connect using SSMS, and run queries using SQLCMD, but when I try to connect from C# using the SqlConnection it fails to open the connection with a SqlException:
A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)
Here is my code:
using (SqlConnection conn = new SqlConnection(#"Server=LDNPSM050000137\PLN000000014T;Initial Catalog=MiscData;Integrated Security=True;"))
{
//exception occurs on this line
conn.Open();
//use connection
conn.Close();
}
I get a similar response using ODBC:
string connectionString = #"Driver={SQL Server Native Client 10.0};Server=LDNPSM050000137\PLN000000014T;Database=MiscData;Trusted_Connection=yes;";
using (OdbcConnection connection = new OdbcConnection(connectionString))
{
connection.Open();
}
This fails with an OdbcExcpetion:
ERROR [08001] [Microsoft][SQL Server Native Client 10.0]SQL Server Network Interfaces: Error Locating Server/Instance Specified [xFFFFFFFF].
ERROR [HYT00] [Microsoft][SQL Server Native Client 10.0]Login timeout expired
ERROR [08001] [Microsoft][SQL Server Native Client 10.0]A network-related or instance-specific error has occurred while establishing a connection to SQL Server. Server is not found or not accessible. Check if instance name is correct and if SQL Server is configured to allow remote connections. For more information see SQL Server Books Online.
I have checked the server and instance name are correct, and the server is configured to allow remote connections because I can connect through SSMS. Does anybody have a suggestion of what the problem could be or how to resolve this?
Update:
In case this helps somebody diagnose the problem - This is specific to my machine/user account. My colleague can run the code fine from his machine. I am also able to connect to my local instance using a connectionstring with the appropriate changes to the Server and Initial Catalog.
The error occurs for all remote database servers.
I'm not sure if this is specific to my company's specific IT infrastructure - but the reason this was not working for me was because the project was saved in My Documents which stored on a network share. Apparently .NET will not let you connect to a remote database server when the executing code is located on a network share - it work fine when I copied the project to my local drive. I am using Windows 7 and Visual Studio 2012.
Network shares by default have partial trust, so things that work when a project is on your local drive, e.g. connecting to remote server, won't from network location.
You can give the network location full trust (https://msdn.microsoft.com/en-us/library/zdc263t0(VS.80).aspx) or move your project onto your local drive.
I think the problem is the Server value in your Connect string:
From MSDN
I think you need to do this:
Server=tcp:LDNPSM050000137\PLN000000014T
Server=np:LDNPSM050000137\PLN000000014T
Depending upon whether you want to use TCP or Named Pipes...
i have finished a desktop c# project in which i make use of Entity framework 5 and SQL server 2008
in my machine it's working well, but i created a virtual machine and tried to deploy it there and I have problems.
I get this error : System.Data.EntityException: The underlying provider failed on Open. --->
System.Data.SqlClient.SqlException: A network-related or instance-specific error occurred while establishing a connection to SQL Server.
The server was not found or was not accessible.
Verify that the instance name is correct and that SQL Server is configured to allow remote connections.
I used installshield for the setup and I have installed sql express in the visrual machine, during the setup I create the database and all the tables.
my connection string is this :name="BussinessContainer" connectionString="metadata=.\Bussiness.csdl|.\Bussiness.ssdl|.\Bussiness.msl;provider=System.Data.SqlClient;provider connection string="data source=localhost;initial catalog=yingyangDB;User ID=username;Password=password;integrated security=True;MultipleActiveResultSets=True;App=EntityFramework"" providerName="System.Data.EntityClient"
Should I change the connection string?
I searched a lot before posting this, but nothing worked..any help?
SQL Express (normally) doesn't create as a "Default instance" - i.e. connecting by localhost isn't sufficient to connect to the local SQL express instance.
You may need to use localhost\SQLExpress to connect to the local SQL Express instance (the instance name may be different, but usually it is not.
Additionally, you specify an Initial Catalog in your connection string, which I assume is pointing at your new DB. However you say that you create the DB during the installation - so that DB may not actually exist in your Instance yet. That may be causing it to fail out. Try taking it out of the string and see if that lets you connect.
I Get this error message whenever I tried to up my aspx page.
An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)
whic is connected in this connection string
SqlConnection conn = new SqlConnection("Data Source=192.168.xxx.xxx;Initial Catalog=DBSample;User ID=dev;Password=pass;Integrated Security=SSPI;"))
The weird thing is that the server that I'm connecting has already hosting some aspx page. I don't knnow if there's missing in my connectiong string Thanks. and I know the server that I'm connecting to is already allowed remote connection since it's already hosted some aspx websites. :(
Thanks!
Do you need to add an instance name to your connection string? Do you have the SQLBrowser service running on the target machine, or do you have to specify a port for the instance?
You also get that very same error when the database doesn't exist at the location that you are trying to connect to. Have tried looking at the connection strings of the aspx pages that are successfully connecting?
edited: Specifying Integrated Security=SSPI means you will be using Windows authentication to login to the database. What user is your aspx page running as (check your app pool)? Does it have the rights to log in to the database? This could also explain why it works on one server but not another.
Are you trying to connect to a hosted SQL Server over TCP/IP?
The reason I ask is some firewalls block traffic over Port 1433.
If not then it is simply a case of validating the connection string details and ensuring the SQL Server Engine is actually running...
Have you EVER been able to connect to this database from the PC you are currently attempting this connection on?