I have Windows 7 64bit as my OS + SQL Server 2008 R2 installed. I can connect to SQL Databases (2008), but cannot connect to a SQL 2005 database.
I can, however, connect to the 2005 SQL Database on a PC that has Windows XP as the OS and also has SQL Server 2008 R2 installed. So it seems that it works fine on XP but not on Windows 7 (32 or 64bit).
is this an Operating System issue?
Cannot connect to OMRSQLV016\PRODSQL002.
A network-related or instance-specific error occurred while establishing a connection to SQL Server. 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: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified) (.Net SqlClient Data Provider)
Error Number: -1 Severity: 20 State: 0