Unable to upgrade Parallels Client due to "Failed to communicate" error

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Symptom

When trying to upgrade Parallels Client for Windows by starting-up or clicking Check for updates now button, it fails because of the following error message:

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Cause

The URL for Client Update has been changed.

Workaround

Upgrade Parallels Client by either of the following ways:

  1. Download a Client installer directly from https://www.parallels.com/products/ras/download/client/

  2. In your client machine, change the value of the following registry key to http://download.parallels.com/ras/RASClient.xml

    For v14.1 or older:
HKEY_CURRENT_USER\Software\2X\AppServerClient\UpdateClientXMLURL

For v15.0 or newer:
HKEY_CURRENT_USER\Software\Parallels\AppServerClient\UpdateClientXMLURL

  3. Create a client policy according to http://kb.parallels.com/123598, enable a checkbox in front of Options then make sure Update URL is set to http://download.parallels.com/ras/RASClient.xml

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