If the SQL Server instance name given is not valid.
The firewall on the server if refuses the connection. Solution: There could be many possible reason of the above error. (provider: SQL Network Interfaces, error: 28 – Server doesn’t support requested protocol) (Microsoft SQL Server, Error: -1 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. You should be careful and should configure the firewall on the server to accept connections.Įrror 2: An error has occurred while establishing a connection to the server.
Solution: This error occurs when firewall on the server refuses the connection. The timeout period elapsed prior to completion of the operation or the server is not responding.
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