![]() ![]() ![]() ![]() This error may be caused by network problems or insufficient security rights. When this happens the user profile service logs an event with ID 1509 and source User Profile General in the application event log: Windows cannot copy file \\?\C:\Users\Default\ to location \\?\C:\Users\username\. The permissions for SYSTEM and Administrators are not relevant, but if for some reason the user logging on does not have read permissions on C:\Users\Default the error message User Profile Service Failed the Logon will be displayed and logging on is not possible. This results in SYSTEM and Admninistrators having full control, while Users and Everyone have read permissions. If all is well, the directory C:\Users\Default inherits permissions from its parent folder, C:\Users. This typically happens when the default profile, stored in C:\Users\Default, has incorrect permissions or is corrupt in some way. The User Profile Service failed the logon. When Windows cannot even create a temporary profile you get to see the following error message: In addition to that, there is an entirely different category of errors that occur when even a temporary profile cannot be created. I have written about possible causes for that here. Many errors related to user profiles result in the user getting a temporary profile instead of the regular local or roaming profile. This article is part of Helge’s Profile Toolkit, a set of posts explaining the knowledge and tools required to tame Windows user profiles. ![]()
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