Unable to download any virtual appliance. Unable to connect to the Parallels Appliance server

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Symptoms

"Unable to download any virtual appliance." error message appears when trying to download any virtual appliance from the Parallels Wizard:

        Unable to connect to the Parallels Appliances server.
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Cause

Error while downloading appliances.xml

Resolution

  1. Make sure that you have stable internet connection on your Mac.
  2. Open Terminal.app and execute:

    ping download.parallels.com
    
  3. Make sure that the address is resolved and you receive response from the server.
  4. If you cannot connect to download.parallels.com please check DNS settings and make sure that port 443 is opened for TCP protocol (FireWall settings).

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