Eventid 40960 : The failure code from authentication protocol Kerberos was "No authority could be contacted for authentication from Workstation

[Ranjith Dass]

Hi Team,


We are experiencing the event id 40960 from half of our Windows 10 workstations - ( These workstations are spread across different sites ) . Though the sites were having local domain controller before , due to some issues , these local DC's were removed and now the workstation from these sites are connected to the main domain controller.


"The failure code from authentication protocol Kerberos was "No authority could be contacted for authentication from couple of site Workstation"


The user can log on to the workstation , but unable to get the mapped drives workings , GPO not getting applied etc.

Even if we browse from these workstation to any of the DC's "netlogon" folder , it is prompting for the user name and password.


Have tried the following and still could not get the issue resolved -


DCDIAG - no error reported from the DC's ( two DC's are the main site) - Windows 2016 DC's

nltest - no error

dns - no error

etc


Removed the WS and added back to the domain


Checked the MTU Size and no fragmentation at all


Ran out of idea and hit the wall -- please help

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