Symptoms
The following error message appears while launching a published resource in from the Parallels RAS HTML5 portal:
Cause
The WebSocket header is blocked by a hardware/software router or firewall. A debug console will show the following:
To verify the symptom, when the error occurs, hit F12 > Network tab > WS > RDP
Resolution
Parallels RAS HTML5 using the following protocols: WS, WSS, HTTP/1.1
Once the filtering rules are enabled the code '404' will change to '101' and 'Response Headers' will contain a hash, as on the screenshot below:
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