as it seems you didn't buy the game in the past 12 years, I guess I won't be missing too much money...
As there's absolutely no reason I'd do a change to the network code just now after 12 years it was working, the most likely reason is a change in your network configuration ; for example, in your ISP settings.
But anyway, I will do a push-through server for TE4, so you'll likely be able to host with it, and go on playing for free.
== Mana Games ==
>> I don't answer Private Message, except if it's really a _Private_ topic <<