Users will see follwing event in event viewer :
We saw that with in some situations Disabling Malware Inspection used to fix the issue but in some case we have to disable Malware Inspection + NIS
After doing the investgation we have found that issue was with one of the Antimalware signature was released and that caused issue.
So to resolve this fix is :
Re enable Malware Inspection and then Install latest defnitions from Update center in TMG Console
We can check version in registry at this location HKLM \Software\Microsoft\fpc\EmpScanner\Versions\mpasdlta.vdm and mpavdlta.vdm , It should be above 1.115.58.0
Like this :
If this will not resolve the issue, please open a Ticket with Microsoft CSS.
Authors
Junaid Ahmad Jan , Support Escalation Engineer
Mohit Saxena, Security Team Manager