SQL Server 2005 – Problem Accessing the Server

disaster recoverysql-server-2005

I have SQL Server 2005 which is installed on server machine.

I was working fine on SQL server before I change the server machine IP. I changed server machine IP to host the Web Service on it.

But now when I enter the Login and Password information SQL Server displays this error message:

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: Named Pipes Provider, error: 40 – Could not open a connection to SQL Server) (Microsoft SQL Server, Error: 2)

I also tried to remove Server machine IP, Still I can't able to access the SQL Server.
My all database stucked in it. Or can I recover my SQL server database?

Best Answer

  1. Make sure SQL Server Service is running
  2. If a named instance, make sure SQL Server browser service is running
  3. Make sure SQL Server is configured to allow remote connections
  4. Examine the SQL Server error log for messages confirming that SQL is listening on the expected network interfaces and ports
  5. Test server connectivity with PING from the client machine

  6. Test port connectivity using TELNET or PowerShell to the server and port (from step 4) from the client machine. For example

    a. TELNET 1433

    b. PowerShell:

1433 | % { echo ((new-object Net.Sockets.TcpClient).Connect("YourServerName",$_)) "server listening on TCP port $_" }

  1. Check firewall settings if step 5 or 6 connectivity test fails

For further read below forum discussing the same which would be helpful to you for troubleshooting :

https://stackoverflow.com/questions/18060667/cannot-connect-to-server-a-network-related-or-instance-specific-error

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