An authentication error occurred. See the VNC Server error log for details.

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This error is likely because the Netlogon service is not running. Please check that the service is running and set to Automatic for startup type. 

If you have recently upgraded to Server 2016, then there is a known issue that the startup type is changed to Manual erroneously. Please see https://support.microsoft.com/en-us/help/3201247/netlogon-service-doesn-t-retain-settings-after-in-place-upgrade-to-win for more information. 

 

If the service is already set to Automatic and running, can you please check that the user (or group they belong to) that you are logging in as is not being blocked in Group Policy? The relevant policies are:

Computer Configuration > Windows Settings > Security Settings > User Rights Assignment > Access this computer from the network
Computer Configuration > Windows Settings > Security Settings > User Rights Assignment > Allow log on locally
Computer Configuration > Windows Settings > Security Settings > User Rights Assignment > Deny access to this computer from the network
Computer Configuration > Windows Settings > Security Settings > User Rights Assignment > Deny log on locally

 

N.B. They may also be set in

Computer Configuration > Windows Settings > Security Settings > Local Policies > User Rights Assignment


so please check both locations.

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