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Fix for "Cannot Connect to Database Master at SQL Server at Server Name. The Database might not exist, or the current user does not have permission to connect to it" SharePoint Error! -
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Unable to connect to SQL Server using "localhost" as the server name · Issue #2075 · dotnet/SqlClient · GitHub
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How to Fix Login Failed for User (Microsoft SQL Server, Error: 18456) Step-By-Step – Add SQL Administrator to SQL Management Studio – ITProGuru Blog
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