After upgrading a Symantec Endpoint Protection Manager (SEPM) from 11.x to 12.1, the httpd.exe process utilizes 100% of the CPU making the computer unusable. This occurs when the 12.1 SEPM is managing Symantec Endpoint Protection (SEP) 11.x clients.
Three workarounds exist for this issue:
Reconfigure the SEPM
Make the following changes in the \apache\httpd.conf file.
Remove # symbol in #Win32DisableAcceptEx (Note: This requires that all client groups are set to PULL mode for their communication settings. If any client groups remain in PUSH mode, then this change may cause client communication to fail or even cause the SEPM to become unresponsive.)
Save the Httpd.conf file and restart the Symantec Endpoint Protection Manager Web Server
If the client groups are using PUSH mode or the workaround is not effective in your unique environment, then Disable Learned Applications for *each* client group.
Upgrade all 11.x clients to 12.1
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