Ī connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond. : SQL Server Network Interfaces: Error Locating Server/Instance Specified. For more information see SQL Server Books Online. Check if instance name is correct and if SQL Server is configured to allow remote connections. : A network-related or instance-specific error has occurred while establishing a connection to SQL Server. Provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified Verify that the instance name is correct and that SQL Server is configured to allow remote connections. The server was not found or was not accessible. The A network-related or instance-specific error occurred while establishing a connection to SQL Server error represents one or more of the following error messages:Ī network-related or instance-specific error occurred while establishing a connection to SQL Server. If you are experiencing login failures, ensure the user has a login at the server level and appropriate permissions to connect to the database that the user is trying to connect to.Ī network-related or instance-specific error occurred while establishing a connection to SQL Serverįor more information about the relevant error, see the following Verify connection errors section.
Also check if network drivers are up to date.
Check the Windows event logs on problematic client for additional pointers. If you are able to, then the issue could be specific to the client or login that is experiencing the issue. For instructions on the procedure about UDL test, move to Connect to SQL server by using a UDL file section.Ĭheck if you are able to connect to SQL Server from other client systems and different user logins. If it works, then there may be an issue with the connection string.
If you notice any issues, work with your network administrator to fix the same.Ĭheck if SQL is listening on appropriate protocols by reviewing the ErrorLog.Ĭheck if you are able to connect to SQL server by using a UDL file. Verify basic connectivity over IP address and check for any abnormalities: ping -a, ping -a. This is an informational message no user action is required. SQL Server is now ready for client connections. These are typically found in Web.config files for ASP.NET applications.Įnsure SQL server is started and you see the following message in the SQL Server ErrorLog: If the connections are failing from an application, the connection string from the app. Īpplication and System event logs from SQL Server and Client systems. TCP/IP and port number: Server is listening on. Named pipes: Server local connection provider is ready to accept connection on. Network libraries and ports the SQL instance is listening on.
You can search for "Server name is" string to get this info in the errorlog.