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SQL Server 2008 R2 failover cluster fails when the Security Agent (SA) of Worry-Free Business Security (WFBS) 8.0 is installed

    • Updated:
    • 24 Nov 2016
    • Product/Version:
    • Worry-Free Business Security Standard/Advanced 8.0
    • Platform:
    • Windows 2008 Enterprise
    • Windows 2008 Server R2
    • Windows 2008 Small Business Server
    • Windows 2008 Standard
When SQL Server 2008 R2 and WFBS 8.0 SA with Virus Scan Engine drivers are installed in the same system, cluster failover fails resulting in the following errors:
  • WSFC Resource Deadlock
  • The cluster resource host subsystem (RHS) stopped unexpectedly
This issue does not occur in WFBS 7.0.
Because WFBS 8.0 uses different drivers for Real-time Scan than WFBS 7.0, this issue will not happen on WFBS 7.0.
The issue has been confirmed in an InterOP issue between Microsoft DpmFilter and Trend Micro Virus Scan Engine drivers.
The InterOP issue occurs because of a deadlock. The deadlock happens when the DpmFilter tries to read status files on a newly mounted volume that it is not attached to. The Scan Engine hooks the I/O request and tries to scan the files. The DpmFilter in turn hooks the I/O request made by the Scan Engine. Consequently, the deadlock is encountered because the previous operation did not finish.
Microsoft DpmFilter is also used for the backup application "Data Protection Manager" for optimized replication. It tracks all writes happening on files (example SQL DB) of the volume, and keeps a bitmap of modified blocks.
To fix the issue, enable BypassDpmFilter.
For security agent deployment:
  1. Go to HKLM\SYSTEM\CurrentControlSet\Services\TmFilter\Parameters.
    Note: The "TmFilter" registry path may differ among products.
  2. Add a DWORD value "BypassDpmFilter" and set its value to "1".
  3. Close the Registry Editor.
For security server deployment:
  1. On the WFBS server, go to ..PCCSRV\ofcscan.ini.
  2. Open ofcscan.ini using a text editor.
  3. Under [Global Setting] add the following:
    TmfilterBypassDpmFilter = 1
  4. Save the file and then close text editor.
To verify if the issue has been resolved, go to the Client server and check if the following settings are present in the registry:
Value: BypassDpmFilter
Expected value : (DWORD)1
Solution Id:
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