When Launching an Application Internally via Netscaler User Receives Error: "Cannot Connect To The Citrix XenApp Server. There Is No Citrix XenApp Server Configured On The Specified Address"

When Launching an Application Internally via Netscaler User Receives Error: "Cannot Connect To The Citrix XenApp Server. There Is No Citrix XenApp Server Configured On The Specified Address"

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Article ID: CTX217065

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Updated On:

Description

With a NetScaler Gateway and StoreFront setup, while launching application users get following or similar errors:

  • "Unable to launch your application. Contact your help desk with the following information. Cannot connect to the Citrix XenApp server. There is no Citrix XenApp server configured on the specified address"
ICA file which gets downloaded on client machine will have internal Xenapp Sevrer's IP address instead of the STA ticket as highlighted below:

Example of ICA File:
[ApplicationServers]
App123=

[App123]
Address=1.2.10.200:1494
AutologonAllowed=ON
BrowserProtocol=HTTPonTCP
CGPAddress=*:2598
ClearPassword=E6954E0E16B68B
ClientAudio=On
DesiredColor=8
DesiredHRES=0
DesiredVRES=0
 

Resolution

To resolve this issue, you need to modify the web.config file for the store(s) on the Storefront Server(s).
  1. Navigate to: "C:\inetpub\wwwroot\Citrix\Store" (Change Store to the name of the relevant Store)
  2. Open the web.config file for the Store and remove the Optimal Gateway configuration from the file
User-added image
Just leave the first line with a space and a slash as shown below

Before:
 <optimalGatewayForFarmsCollection> ***Delete this line***
  <optimalGatewayForFarms enabledOnDirectAccess="true">
    <farms>
      <farm name="farmname" />
    </farms>
    <optimalGateway key="_" name="deploymentname" stasUseLoadBalancing="{true | false}"
     stasBypassDuration="hh:mm:ss" enableSessionReliability="{true | false}"
     useTwoTickets="{true | false}">
      <hostnames>
        <add hostname="appliancefqdn:port" />
      </hostnames>
      <staUrls>
        <add staUrl="https://stapath/scripts/ctxsta.dll" />
      </staUrls>
    </optimalGateway>
  </optimalGatewayForFarms>
  <optimalGatewayForFarms>
    ...
  </optimalGatewayForFarms>
</optimalGatewayForFarmsCollection>
 
After changes:
<optimalGatewayForFarmsCollection />
<resource…etc etc…

Problem Cause

This is a known issue with Storefront 3.0.1+. 
By default if the Optimal Gateway feature is enabled on Storefront, it will generate an internal ICA file with IP address of internal XenApp server instead of STA ID which will cause launch failures through Netscaler Gateway 
 
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