@johnpoz:
"Modem is connected directly on pfSense WAN card"
Depends if what your calling a "modem" is really a modem and not a gateway. What is your pfsense wan IP, does it start with 10.x.x.x, 192.168.x.x or 172.16-31.x.x ?
"I have now tracked the problem down to the squid proxy"
thought you said they could make it work for you since they changed something?
Modem is the real cable modem. IP of wan is 81.x.x.x
If you watch the tests in the first post, you see the tunneling of rtmp isn't blocked. I guess they didn't use tunneling in the past, turned it on for a moment (the moment it worked for me) and now turned it back off.
From what i've read flash ignores proxy settings and tries to use port 1935, 80 or 443 and if this doesn't work alot of website will try to send the data in a capsulated http packet. They don't use that method for some reason. I've tried to add port 1935 to the squid savelist but that didn't fix it.