"HTTP Error 500.0 - Internal Server Error" appears when accessing the Worry-Free Business Security (WFBS) console

- Updated:
- 13 Apr 2020
- Product/Version:
- Worry-Free Business Security Standard 7
- Worry-Free Business Security Standard 8
- Worry-Free Business Security Standard 9
- Worry-Free Business Security Standard/Advanced 7.0
- Worry-Free Business Security Standard/Advanced 8.0
- Worry-Free Business Security Standard/Advanced 9.0
- Platform:
- Windows 2008 Enterprise
- Windows 2008 Essential Business Server
- Windows 2008 Server R2
- Windows 2008 Small Business Server
- Windows 2008 Standard
- Windows 2011 Small Business Server Essentials
- Windows 2011 Small Business Server Standard
- Windows 2012 Enterprise
- Windows 2012 Server Essentials
- Windows 2012 Web Server Edition

Summary

When accessing the WFBS console or configuring the Messaging Security Agent (MSA) component, the following error occurs:

HTTP Error 500.0 - Internal Server Error
Calling LoadLibraryEx on ISAPI filter "C:\Windows\Microsoft.NET\Framework\v4.0.30319\\aspnet_filter.dll" failed.

Details

The above error appears, because of an incorrect path that was set on the ISAPI filters of OfficeScan or SMEX website in IIS.

To resolve this:

Open IIS Manager.
Select which site you want to configure

For WFBS Console: Expand Sites > OfficeScan.
For MSA Console: Expand Sites > SMEX Web Site.

In the middle pane, select ISAPI Filters.
Expand the columns as required and look for an Executable path with "\\".
Click Edit:

From the above screenshot, change the "\\" to "\". The path will be:

C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_filter.dll
Restart the IIS service and access the WFBS or MSA console again.