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CS Dental Employee
CS Dental Employee

'Unable to launch your application' in Citrix Receiver when attempting to connect to applications

Problem: When launching published applications, an error similar to the following appears:

unable to launch.pngCitrix Receiver window: Unable to launch your application. Contact your help desk with the following information: Cannot connect to the Citrix XenApp server. The Citrix SSL server you have selected is not accepting connections.









Cause: The IP address for or has changed and the local DNS (Domain Name Service) cache has not been updated. Typically this cache is updated on a system restart, though in some cases it may need to be updated manually.


Solution: Update the local DNS cache using the following instructions.


For Windows PCs:


  1. Hold the Windows key on your and press R (Win-R). Type cmd and press Enter.
  2. A black Command Prompt window will appear.
  3. Type in the command ipconfig /flushdns and press Enter. The message, 'Successfully flushed the DNS Resolver Cache' will appear.
  4. Close the window (or type exit and press Enter).


On Macintosh computers:

  1. Check About to see what version of Mac OS X you have (Apple menu->About)
  2. Open the Terminal by opening Finder and navigating to Applications, Utilities, then Terminal.
  3. Type the following command and press Enter. 

    Mac OS X Yosemite and later:
    sudo killall -HUP mDNSResponder

    Mac OS X Yosemite v10.10 through v10.10.3:
    sudo discoveryutil mdnsflushcache

    Mac OS X Mavericks, Mountain Lion and Lion:
    sudo killall -HUP mDNSResponder

    Mac OS X Snow Leopard:
    sudo dscacheutil -flushcache

  4. Type in your system password if prompted.
  5. Close the terminal window.
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