MABS v2: Creation of a Protection Group fails with error 33507 related to running Trend Micro Antivirus

November 16, 2017 at 9:39 am in Azure, Azure Backup, Error 33057, MABS, Microsoft Azure Backup Server, Microsoft Azure Backup Server v2, PowerShell, Trend Micro by Wim Matthyssen

Last week while assisting a customer with the deployment of a new Microsoft Azure Backup Server (MABS), I ran run across error 33507 when creating a new Protection Group.

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In the Event Viewer on the MABS error 370 was shown several times.

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After troubleshooting for some time, I finally found out the problem was caused by the Trend Micro antivirus (version 12.0.1708) running on the MABS. The issue is caused by an incompatibility between Trend Micro and the DPM filter driver.

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When the antivirus was disabled MABS was able to create the Protection Group. But because running a server without an antivirus solution is not an option you can resolve the issue by adding the following registry key on any MABS server running with Trend Micro.

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\TmFilter\Parameters
Add DWORD (32 bit)
BypassDPMfilter, vaule of 1

You can add the registry key quite easy by running the following PowerShell one-liner (run PowerShell as an administrator).

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After adding the registry key, reboot the server and try the process of creating a Protection Group all over again. I should work now.

Lesson learned, sometimes it’s the easy stuff. Disabling antivirus during a backup problem is often step 1. Now it was more like step 10 but at least in the end it helped fixing the issue. Till next time.

Wim Matthyssen (@wmatthyssen)

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