Bitdefender 2012 blocks all Web Socket traffic.
Please try the following page in Chrome:
http://websocket.org/echo.html
(I tried Chrome 14.0.835.202)
This is certainly not correct behavior since Web Socket is part of HTML 5 and valid traffic.
Using Web Sockets over SSL can mitigate the problem if "Scan SSL" is turned off, but once turned on it filters traffic again.
Also worth noting is that even when everything is turned off in Bitdefender (firewall, anti-virus etc), it will still filter Web Socket traffic.