In any case my guess here is that the router at the office is configured in such a way that I can't access poker servers from work – I don't understand why.
Unfortunately the PokerTH poker server didn't seem to respond during our tests, so I couldn’t' test online games properly. If you want to face real human players you'll have to play a network game, either in LAN or via the Internet. You can play against up to six opponents, all of them controlled by the computer. PokerTH's appearance and behavior are similar to other card games so you'll be playing in no time.