This issue occurs when at least one of the following problems exists: This error usually means that the client can't find the SQL Server instance. "SQL Server does not exist or access denied" For more information see SQL Server Books Online. Check if instance name is correct and if SQL Server is configured to allow remote connections. Login timeout expired.Ī network-related or instance-specific error has occurred while establishing a connection to SQL Server. TCP Provider: No connection could be made because the target machine actively refused it. TCP Provider: No connection could be made because the target machine actively refused it Provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server 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 respondĪ 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. : 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 Provider: TCP Provider, error: 0 - No such host is known. Provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server (Microsoft SQL Server, Error: 53) 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. 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: 53)Ī network-related or instance-specific error occurred while establishing a connection to SQL Server. You can check the following details to see if you're encountering one of the following error messages: "A network-related or instance-specific error occurred while establishing a connection to SQL Server. The complete error messages vary depending on the client library that is used in the application and the server environment. This article provides some steps to help you troubleshoot these errors, which are provided in order of the issues from simple to complex. When connecting to a SQL Server instance, you may encounter one or more of the error messages below.
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