Yeah, I'm with Mark Lord: That log file entry on your router certainly makes it look like the router is the thing blocking the site.

But the fact that the problem only occurs in Firefox is a bit of a stumper. Since IE and Chrome don't have a problem, it makes me wonder what's up on the router. So we go back to the router log:



What's that 49991 in there? Is that a TCP port number? What is Firefox doing sending a TCP packet on that port? If so, I'll bet *that* is what the router was blocking: The strange TCP port.