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Symptoms

Texplore fails to connect to a custom application on a host, and displaying the error details shows a very long error message that begins like the following:

Further down in the error message, it indicates “The request filtering module is configured to deny the file extension”:

Explanation

By default, Internet Information Services includes a Request Filtering module that prevents the download of certain file types based on their extension, and this typically includes .config files. However, custom applications that utilize Texplore’s automatic download functionality to copy files down to the client system typically include one or more .config files in the \HmiConfig\ folder. When Texplore tries to download these files, IIS returns a 404 NotFound error.

ResolutionFollow the instructions at Installation Requirements to disable Request Filtering.

Confirm the %TSENTRY_SYSDIR%\tpriNtRt\wwwroot\web.config file includes the tags that clear all file extensions from the request filtering module as shown below:

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  ...
  <system.webServer>
    <security>
      <requestFiltering>
         <fileExtensions>
            <clear />
         </fileExtensions>
      </requestFiltering>
    </security>
  </system.webServer>
</configuration>

Alternatively, Request Filtering can be disabled for the website as follows:

• Click on the Request Filtering module for the target website

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• Right-click on the .config File Extension and choose Remove

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