You encounter increased logon times with Citrix User Profile Manager (5.1.0.25 and 4.1.2.2) on systems that run VSE 8.8 Patch 2 or Patch 4.

When the increased logon time occurs, you see multiple timeout errors in the Windows Application Event logs similar to the following:
 

Event ID: 5051
User: NT AUTHORITY\SYSTEM
Description: A thread in process took longer than <nnn> ms to complete a request. The process will be terminated.

Event ID: 6006
Description: The winlogon notification subscriber took 89 second(s) to handle the notification event (Logon).

NOTE: The timing of events coincides with the tried logon times.