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We can connect to the instance of SQL Server by using its server name, its FQDN, or its IP address followed by a comma and the port number.įor example (if SQL Server ‘default’ instance is running on TCP Port 3000). #1: Include TCP Port number in the connection string So, in this blog, we will dig into the available solutions/workarounds from the client application side when we run SQL Server ‘Default’ instance on a non-default TCP Port.Īs the KB articles above indicate, we have 3 possible solutions to make the application connectivity work. Moreover, we have seen that each one of the above 3 solutions do not resolve the issue with all the different Microsoft data providers. You can also connect to the instance of SQL Server by using its server name, its FQDN, or its IP address followed by a comma and the port number.”īut we felt that the topic needs further clarification and it may be helpful if we fully understand the implications of each solution/workaround. If a default instance is listening on a port other than the standard 1433 port, you can provide an alias or change the global default port. “The network libraries assume either 1433 or the global default port established with the Client Configuration Utility. We have a few KB articles (or blogs) that briefly talk about this scenario and necessary steps to make it work, for example –
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The behavior is same for Windows and SQL authentication. It is also worth noting that, unlike a named instance, our client network libraries don’t attempt to discover the TCP Port dynamically using SQL Server browser service for a ‘Default’ instance. The error occurs because, by default, our client network libraries (used in our client data Providers) attempt to connect to TCP Port 1433 for a ‘Default’ instance of SQL Server.
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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. “A network-related or instance-specific error occurred while establishing a connection to SQL 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” “An error has occurred while establishing a connection to the server.
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“SQL Server does not exist or access denied.” But, we will limit our discussion to the scenario where we enforce (or expect) ‘TCP connection’ either via application connection string or client and/or SQL Server network configuration.ĭepending on the client data provider (MDAC/SNAC/SqlClient) we may get errors like below (or a variant of these) – If we use a syntax “DataSource=SqlServerName”, other enabled protocols like Named Pipes are attempted (depending on client network configuration and protocol order) as well and connection could still be successful with another enabled protocol. NOTE: We have used the syntax tcp:sql2005 to explicitly specify TCP connection. If a ‘Default’ instance of SQL Server is configured to listen on a non-default TCP port, with out-of-the-box client configuration the connection to SQL Server from an application over TCP/IP may fail.įor example, if we have a ‘Default’ instance running on a non-default TCP Port and we use a connection string like this – “Provider=SQLOLEDB.1 Integrated Security=SSPI Initial Catalog=Northwind Data Source=tcp:sql2005” - we may get an error as shown below. But we have seen that some customers prefer running SQL Server ‘Default’ instance on a TCP Port other than 1433 (a non-default TCP Port) – primarily for security reasons. We know that with the default setup of SQL Server (SQL Server 2000/2005/2008), the ‘Default’ instance listens on TCP port 1433.