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Event ID: 1521 Source: Microsoft-Windows-UserProfilesService

Level
Description
Windows cannot locate the server copy of your roaming profile and is attempting to log you on with your local profile. Changes to the profile will not be copied to the server when you log off. This error may be caused by network problems or insufficient security rights.

DETAIL - The specified path is invalid.
Comments
 
This event is very similar with event id 1521 from Userenv. See the link below for several comments related to that event id.

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