Login failed for user . Reason: Token-based server access validation failed with an infrastructue error

• ramana3327

  SSCoach

  Points: 19722

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  January 11, 2016 at 2:53 pm

  #307589

  Hi,

  We have 3 instances on the box.

  I can able to connect to default instance (2000) but not able to connect to the named instance (2008 r2). I can see the error from error logs

  Login failed for user ''. Reason: Token-based server access validation failed with an infrastructure error. Check for previous errors.

  My login is under the administrator groups on the machine.

• sqlquaker

  Say Hey Kid

  Points: 697

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  January 11, 2016 at 3:14 pm

  #1851172

  See if the fix suggested by DarrenMB helps to resolve your issue. http://stackoverflow.com/questions/17029073/cannot-connect-to-sql-server-named-instance-from-another-sql-server

  -Thanks

• johnwalker10

  SSCrazy Eights

  Points: 9124

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  January 11, 2016 at 10:59 pm

  #1851230

  Disable UAC, firewall off and run SQL Server Management Studio as administrator

  or check this link: http://www.sqlserverlogexplorer.com/fix-microsoft-sql-server-login-failed-error-18456/