Folder Redirection fails with the error ERROR_SEM_TIMEOUT or the semaphore timeout period has expired
You have a computer running Windows Vista or Windows 7 in a domain. You find out the Folder Redirection policy is not working on the client machine. When you look at the event log, you see following event logged:
Log Name: Application
Source: Microsoft-Windows-Folder Redirection
Date: <Date & Time>
Event ID: 502
Task Category: None
User: <User Name>
Computer: <Computer Name>
Failed to apply policy and redirect folder "Documents" to "<a network share>".
The following error occurred: "Failed to copy files from "C:\Users\<UserName>\Documents" to "<a network share>".
Error details: "The semaphore timeout period has expired".
Process Monitor is an advanced monitoring tool for Windows that shows real-time file system, Registry and process/thread activity. Refer to the following web page for more information about this tool:
Refer to the following web page for more information about the 259-Character limitation:
The following two errors share the same error number, and this is the reason why the error message "The semaphore timeout period has expired" is displayed.
Error Number - Error Code - Meaning
0x79 - ERROR_SEM_TIMEOUT - The semaphore timeout period has expired.
0x79 - DE_PATHTOODEEP - The source or destination path exceeded or would exceed MAX_PATH.
Refer to the following web pages for more information about the two errors:
Article ID: 2570355 - Last Review: 07/12/2011 16:14:00 - Revision: 2.0