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BSOD after upgrading to DCS 6.5 MP1 on Windows Server 2003 R2


Article ID: 162454


Updated On:


Data Center Security Monitoring Edition Data Center Security Server Data Center Security Server Advanced


After upgrading to DCS 6.5 MP1 Agent on Windows Server 2003 R2 system stability is reduced due to a BSOD.

The Windows Server 2003 R2 machines may crash in symefasi.sys due to a BugCheck 4E, {9a, 7c78, 6, 2}, PFN_LIST_CORRUPT (4e).


An optimization in the version of symefasi.sys included in DCS agent v6.5 MP1 exposed a race condition in the operating system which resulted in the BSOD.



A hotfix to resolve this issue has been created and is attached to this document.

If you have an error during installation of the hotfix, ERROR 1260, please see the attachment in the following KB document:

Upgrade fails with error 1260 -



6.5MP1 HF1 Windows get_app