It's incredibly strange...
After testing for the last 24 hours:
One thing seems constant encrypted traffic passes without problem (at normal
rates of speed).
Unencrypted traffic has problems from various networks (even when I try HTTP
on different ports).
It also seems that it's independent of Windows/IIS. We spent 7.5 hours on
the phone with Cisco Friday validating our switches, and our routers. No
problems there. Cisco thought it was Code Blue, but my tests using Unix
machines are indicating that may not be the case.
I've setup a few files to test with (they are all the same ActiveState PERL
https://store.ware.net/perl.exe <--- This one works for everyone.
http://220.127.116.11/perl.exe <--- Unix