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I'm getting Windows event log messages about Pre-authentication failed: Event ID 675
Posted by Daniel Orme on 06 October 2013 09:32 AM

It can be avoided by disabling the NTLMv2 authentication option in the NAS Microsoft Networking > Advanced options.

 

For reference, check here: http://answers.microsoft.com/en-us/windows/forum/windows_7-security/error-code-0x19-kdcerrpreauthrequired/ed5fc1db-6a44-4b16-b6b6-5f55e07c9ca4

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