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 microsoft sql server error 18456 in sql server 200
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Yak Posting Veteran

62 Posts

Posted - 11/21/2012 :  12:15:38  Show Profile  Reply with Quote
microsoft sql server error 18456 in sql server 2008 r2
login failed for user sa

sql server was working properly

i just restarted the system and then i started getting the above error
how do i resolve it

i am able to login with windows authentication but not sql authentication

Posting Yak Master

212 Posts

Posted - 11/21/2012 :  23:08:46  Show Profile  Visit prett's Homepage  Reply with Quote
I found a good Microsoft article on this error, Please read it:
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Starting Member

1 Posts

Posted - 12/03/2014 :  07:26:00  Show Profile  Reply with Quote
Read something useful om this site unspammed
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Yak Posting Veteran

United Kingdom
84 Posts

Posted - 12/05/2014 :  06:34:20  Show Profile  Reply with Quote
Since you just said you restarted the system. Can it be possible somebody changes authentication mode to windows Only. Please check

Hope this helps

SQL Server MVP
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