Technical FAQs

# PME 7.2.2 Web Page fails to load with error “ISAPI Filter ‘C:\Windows\Microsoft.NET\Framework\v4.0.30319\\aspnet_filter.dll’ could not be loaded due to a configuration problem”

Issue
When a user attempts to launch the PME Web Applications page they receive the error message shown below:

“ISAPI Filter ‘C:\Windows\Microsoft.NET\Framework\v4.0.30319\\aspnet_filter.dll’ could not be loaded due to a configuration problem”

Product Line
PME 7.2.x

Environment
Microsoft Windows Server 2008 / 2008 R2 / 2012 / 2012 R2

Cause
A possible Microsoft update (exact cause unknown) created the issue when updating an existing or installing a new ISAPI handler to IIS.
The update mishandled the path by inserting \\ instead of \ into the executable path causing IIS to be unable to load the filter.
This caused the 500 Internal Server errors to sites/applications running application pools in 64bit mode.

Resolution
Open the IIS Manager < Default Web Site < ISAPI Filters

Expand the columns as required, looking for an Executable path with \\ in it, then click Edit:

As seen in the above screen capture change the \\ to \ so the path reads:

C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_filter.dll

Perform an iisreset through a command prompt and the PME Web Applications page will now load normally.