Known Issue: Test connection failed showing HTTP Error 500.0 – Internal Server Error when establishing OPC HDA server and Aspen Mtell server connection

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Last Updated: 07-Jun-2022
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Article ID: 000099843
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Problem Statement 
An error is observed when attempting a test connection between the OPC HDA server and Aspen Mtell server through the "Test" button under Configuration --> Settings --> Sensor Data Sources on Mtell System Manager.
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The following error is also observed when loading the HoneywellPHD adapter URL on the internet browser. (Application can be browsed through Internet Information Services (IIS) Manager --> localhost server --> Sites --> AspenTech --> AspenMtell --> Adapter --> right click HoneywellPHD --> Manage Application --> Browse)

HTTP Error 500.0 – Internal Server Error
Calling LoadLibraryEx on ISAPI filter “C:\Windows\Microsoft.NET\Framework\v4.0.30319\\aspnet_filter.dll" failed
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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.
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  1. Look in the Executable column for any executable path containing two backslashes. Right click on edit and find the double backslashes.
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  1. Delete one of the backslashes and then click OK.
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  1. Reload the HoneywellPHD adapter URL on the internet browser to confirm that error has now resolved.
  2. Go to Mtell System Manager and click on the "Test" button again to confirm that the connection has now been established.
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Keywords
Test Connection Failed
ISAPI filter
HTTP Error 500.0