Originally Posted by anotherbrian
I've had all sorts of trouble connecting to my Slingbox remotely from hotels [no probs when using T-Mobile from Starbucks, RCC's, etc.], and still don't know if it is hotel NAT, firewall, or timing issues. I've found I can tunnel it through a VPN connection at work most of the time (depending on which VPN gateway I connect to, as their configurations differ), though the performance isn't nearly as good as direct.
put your slingbox on port 443. I have had no problems since then. Firewalls at work locations, hotels, etc.