Hi there guys.
I'm vodafone broadband customer and I've found that websockets over port 80 don't work for me (if I use vodafone broadband)
After some surveys of friends of mine and guys from reddit and other local web communities I've realized that this issue is probably location-specific (still unsure) and not ISP specific (sure 100%)
Could you please check if it works for you at http://websocketstest.com/ and write down your ISP, and if possible - location (after the test there is a link below to a test results, you could use it instead of taking a screenshot)
Thank you.