Citrix Receiver Does Not Respond When Opening Applications to XenApp Servers

This article is intended for Citrix administrators and technical teams only. Non-admin users must contact their company’s Help Desk/IT support team and can refer to CTX297149 for more information.

When opening applications to XenApp servers, there is no response at the Launching… prompt, as shown in the following screen shot:

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Eventually, any of the following errors might appear:

“Attempting to reconnect…”

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Or

“Unable to launch your application…”

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Additional Symptoms

  • The output of a netstat command on both client and server indicate that a valid connection is made on ICA ports 1494 or 2598, as shown in the following screen shot:

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  • Record a network packet trace on the client. The TCP stream indicates the following at the end of the conversation (containing either Vergence or Sentillion as the text):

    VergenceVCCl.ICA……c5…`…………………………………………………………………………………………………………………………………………………………………

    …………………………………………VergenceVCCl.ICA……c5…`………………………………………………………………………………………………………………………

    ……………………………………………………………………………………VergenceVCCl.ICA……c5…`…………………………

  • A CDF trace on the XenApp server might indicate the Vergence or Sentillion driver call:

    INIT_RESPONSE: 2, class 3, bc 256, dll VergenceVCCl

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