![]() ![]() 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. ![]() “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. ![]()
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