Good find, that fits the symptoms perfectly and is more likely than not a problem with the firewall on the source end (the campus network). Did you email the author?
As a network engineer it piqued my interest (unemployment is booring) as there were no completely satisfying answers, though some were close. Thought it was the old MTU problem at first but as it was the ack of the handshake being retransmitted it wasn't likely. So tried a few things with my router.
This is how you get NOCs to help you quickly, give them not only the problem but the root cause as well. Its not that they (or me) are lazy, its just that it can be so many things that can be a potential cause of problems, especially when you only have incomplete information to go on.
