If you’re a consultant connecting to remote client servers, or if you have a heterogenous network environment with different Active Directory forests without established trust relationships, you’ll have a few extra challenges connecting to SQL Server using Windows authentication, and SQL Server authentication may not be available.
Moving a database or some of its files from one drive to another or from one instance of SQL Server to another is as simple as detaching it and re-attaching it again. This is actually pretty smart, compared to backup–restore, because you only perform one I/O operation (moving the file), as opposed to two (backing up, restoring).
But when you try to attach the database, you might get something like
Msg 5120, Level 16, State 101, Line 3Unable to open the physical file "E:\Microsoft SQL Server\SQL2014\MSSQL\Data\Playlist.mdf".Operating system error 5: "5(Access is denied.)".
The reason, as I found out the hard way, is that SQL Server can actually modify the file permissions of the .mdf and .ldf files when it detaches a database.
Don’t you just hate it when you once again have to look to Google for help on fixing some obscure Kerberos related authentication problem on SQL Server?
Luckily, I found a blog post about fixing Kerberos problems using a new tool from Microsoft, the Kerberos Configuration Manager for SQL Server. This tool will go through your settings and SPNs and what-not, to help you resolve the problem.