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My old employee has disabled Windows Authentication in our server. Now I'm not able to access the SQL Server even though I have Administrator access to the server. I need to reset the sa password.

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closed as off topic by JNK May 17 '13 at 13:12

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What do you mean, Windows Authentication was disabled? In SQL Server, you have two options for authentication: Windows Auth or Windows and SQL Auth. – Thomas Stringer May 17 '13 at 12:48
@ThomasStringer Windows Administrator login was removed. – Akhil K Nambiar May 17 '13 at 12:49
Ok. If you are a local administrator on the machine, start SQL Server in single user mode (-m) and connect to reset the sa password. – Thomas Stringer May 17 '13 at 12:50
exact duplicate… – Remus Rusanu May 17 '13 at 13:07