I thought in my own insanity that if I published an IIS 8 web server with websockets through HTTPS there shouldn't be a problem even with the TMG.
However, regardless of publishing, filtering and request settings, I don't see any websocket connection upgrade requests reaching the web server when going through the TMG.
Using SignalR I get fallback to whatever lesser transport the browser in question supports. It works great whenever I bypass the TMG of course.
Do I need to find another firewall / filter to get this to work or is there a way?
I'm having trouble even finding information on what products support web sockets, all I see is that weird quote aboute less than 1% of current proxy servers are incompatible, and using HTTPS should alleviate any problems. And whenever I throw "websocket" into a Google search with a Microsoft product - the result is simply gibberish and/or malware sites.
tl;dr: I realize Windows Server 2012 is still not RTM, but is there a way to establish IIS 8 websocket connections through a TMG 2010 SP2?