Citrix Probe Agent: Error "Director was not reachable" While Configuring Director URL

Citrix Probe Agent: Error "Director was not reachable" While Configuring Director URL

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Article ID: CTX276606

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Description

  • Error "Director Not Reachable" is logged while configuring Director URL in Citrix Probe Agent. 
  • The Director URL was accessible via browser from the Probe Agent machine.
  • Probe Agent logs saved at C:\Program Files (x86)\Citrix\Citrix Probe Agent on the probe agent machine shows the below error which does not give much clue.

    ERROR ProbeEndPoint.Log - The parameter is incorrect.
     
    INFO ProbeEndPoint.Log - Director url not configured, skipping task. Rescheduling
  • Collected Fiddler logs from Probe Agent machine while reproducing the error and found that an additional  HTTP Response Header X-Frame Options is configured for the Director website. Compared the HTTP response headers with the Director Website in our lab and did not find this HTTP Response Header.


Screenshot from working Director from internal lab.


 

Environment

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Resolution

  • Took a backup of c:\inetpub\wwroot\Director\web.config
  • Deleted incorrect HTTP Response Header X-Frame Options from Director website leaving the the correct HTTP response header X-Frame-Options as is.  
  • Reset IIS and we were able to configure the Director Probe Agent correctly.

Problem Cause

There was an incorrect HTTP Response Header X-Frame Options configured in IIS Default website and the same was inherited by Director web site.  This caused protocol violation for HTTP  Response Header.  The request for Director URL from Probe Agent failed while validating the HTTP Response Headers of the logon request to Director. 

As per below article Headers names should not have spaces in them.

https://docs.microsoft.com/en-us/dotnet/api/system.net.configuration.httpwebrequestelement.useunsafeheaderparsing?view=netframework-4.8

Additional Information

https://docs.citrix.com/en-us/citrix-virtual-apps-desktops/director/troubleshoot-deployments/applications/app-probing.html
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