Hi,
SEP 12.1 RU6 is now released & it has following fixes related to GUP.
GUP fails to retrieve content from SEPM with error: “GUProxy - not enough memory”
Fix ID: 3652490
Symptom: The Symantec Endpoint Protection client cannot download the full definition contents (full.zip) when multiple concurrent full.zip downloads are in progress from the Group Update Provider.
Solution: Added support for multiple concurrent full.zip content downloads from the Group Update Provider.
After a GUP upgrades to 12.1 RU5, ccSvcHst.exe crashes and creates multiple dump files
Fix ID: 3692462
Symptom: The process ccSvcHst.exe crashes and creates multiple dump files after upgrading the Group Update Provider to 12.1 RU5.
Solution: Updated the code to handle string buffer resize exceptions to avoid process crash.
Clients are incorrectly identified as GUPs
Fix ID: 3639309
Symptom: Clients are incorrectly defined as Group Update Providers when the client hostname contains repeating letters.
Solution: Fixed the string comparison algorithm to correctly determine a string pattern match.
Referene: New fixes in Symantec Endpoint Protection 12.1.6
http://www.symantec.com/docs/TECH230558
Installation and Administration Guide:
http://www.symantec.com/docs/DOC8645