HTTP 400 error during init sync on device

Problem

Device shows 400 Bad Request error when syncing. 

There should be a corresponding error in the AdvancedMobileWOM.short log on the server. Error: System.UnauthorizedAccessException: Access to the registry key 'HKEY_CURRENT_USER\Software\Microsoft\Microsoft SQL Server Compact Edition\v3.5' is denied. 

Solution

  1. Add app pool user to local admin group.
  2. Run IISRESET in Powershell or CMD.
  3. Re-sync device.

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