Aspen Unified and GDOT web viewers not opening after installing Matrikon OPC Simulation Server

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Last Updated: 07-Jul-2021
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Article ID: 000098776
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Problem Statement
After installing the Matrikon OPC Simulation Server the following error shows up when launching either GDOT Web Pages (GDOT-Simulation and GDOT-Online) or the Aspen Unified Web Page:

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

Installing the Matrikon OPC Simulation Server also installed the following programs as prerequisites:
  • Microsoft.NET Framework 1.1 Service Pack 1
  • Visual C++ 2008 x86 Runtime v9.0.30729.6161
  • Visual C++ 2008 x64 Runtime v9.0.30729.6161
These could also be associated with problems with the Internet Information Server on the machine.

Solution
To solve this issue, it is necessary to perform the next procedure:
  1. Go to the Internet Information Services (IIS) Manager, click on the server and double click on ISAPI Filters.
  1. Locate the filter which is associated with the Executable C:\Windows\Microsoft.NET\Framework\v4.0.30319\\aspnet_filter.dll

 
  1. You will see that there is a double backslash, right-click on Edit for the specific filter and delete one of the backslashes like in the images below:
  1. Click on OK and then refresh Aspen Unified web page or any of GDOT web viewers to confirm the solution worked well.
Keywords
Aspen Unified, GDOT web viewer, Matrikon OPC Simulation Server