Hi All,We have see login failures for windows accounts. Below is the error message. Description: In our env most logins are windows accounts. Initially we thought it is an UAC issue and we tried to launch the SSMS using "Run as Administrator". However, we are seeing login failures. Enviroment:Microsoft SQL Server 2014 - 12.0.2402.0 (X64) RTM Enterprise Edition (HyperVisor)Error Message in Error Log : 2015-08-10 22:36:45.290 Logon Error: 18456, Severity: 14, State: 11.2015-08-10 22:36:45.290 Logon Login failed for user 'domain\loginname'. Reason: Token-based server access validation failed with an infrastructure error. Check for previous errors. [CLIENT: 10.xxx.xxx.xxx]2015-08-10 22:41:23.470 Logon Error: 18456, Severity: 14, State: 11.2015-08-10 22:41:23.470 Logon Login failed for user 'domain\loginname'. Reason: Token-based server access validation failed with an infrastructure error. Check for previous errors. [CLIENT: 10.xxx.xxx.xxx]Troubleshooting done: - Recreated the windows login in sql server. Doesn't help.- ran sp_valdidatelogins. it doesn't return any rows.- I belong to sysadmin role and when I say, getting below error message. xp_logininfo 'domain\loginname'/*Msg 15404, Level 16, State 19, Procedure xp_logininfo, Line 64Could not obtain information about Windows NT group/user 'domain\loginname', error code 0x5.*/We tried dropping this account and re-creating the windows account with same permissions but still result is same. It throws same error message. Login failure message !!!Can anybody help me on how to go about further troubleshooting and fix the issue.Thanks in advance.
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