HTML5 page not loading - stuck on spinning circle

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Symptoms

When accessing HTML5 portal from outside network, it doesn't get to the login page, but is stuck on spinning circle.

On localhost or any workstation on the same network with it (inside the firewall), HTML5 loads properly.

Cause

The firewall may be dropping websocket connections, since they're not https once the request is upgraded to websocket.

Resolution

Issue is outside of Parallels Support scope and has to be investigated by a local network engineer to determine where websocket drop occurrs.

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