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Websockets not working with Web Filtering

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Is there a way to allow the new websockets protocol (RFC 6455) to pass through the web filter? Chrome 17, Firefox 11 and IE10 all now support Websockets. There is a test site at:

WebSocket.org | Echo Test

With web filtering disabled this works with all of the browsers listed above. With it enabled the browsers fail to connect. It also works if I add echo.websocket.org to the "Skip transparent mode destination hosts/nets" under the advanced tab, but this will not be feasible once websockets become popular.

I can't find any other settings that may allow it to work.

Cheers
Simon

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