The person in the 2nd link suggested their problem was their printer. lol

So I'm not sure, but does sound like it.
You could try connecting using port numbers between 49152 - 65535 or even port 80.
Tools -> Options -> Advanced -> SuperReallyAdvanced -> Firewalls & set to manual port forward; sample image here
Manual port forward instructions & sample image. Change both listening & connection ports to be the same.
You might also try a less popular program like
Phex for example. If they are blocking certain p2p programs, they might only be doing the popular ones, unless they are blocking p2p bandwidth. Phex is a great program btw, just the interface is not as simplistic as LW is.