WebMonPlg.dll can't be registered on 2008 R2 and TMG ( ONLY)

Versions / Builds Affected

2011

Status

Resolved

Problem Summary

(This issue usually starts as one of the "licencing issues" as the non-working licence key is one of the symptoms.) The WebMonitor Webfilter plugin is not visible in TMG and he WebMonPlg.dll can't be registered manually.

TT / JIRAID

WEBMON-67

How to Identify

When registering the WebMonPlg.dll manually there will be an RegSvr32 popping up with the error code "0xfffffffe". Now you need to continue checking: In the WebMonPlgReg.txt log (can be found in the TMG folder next to the WebMonPlg.dll) you will see: "Failed to add the GfiWebmonitor web filter. Error code is c0040357" (If that log WebMonPlgReg.txt should not exist, you can ask your PSG to provide a tool to identify the issue without it.)

Workaround / Fix Details

The exact reason for this issue is unknown, and it has only been solved in past cases by re-installing TMG.

Required Actions

1. Inform the customer that this is likely an issue on their TMG 2. Attach this article 3. Escalate case