I disabled DHT, and at least now I have some download ability, but the the icon is still yellow in utorrent (no incoming connections). My download speeds are less than stellar, but I've only been running it for a little while... max speed average speed around 40kB/s max at about 250.
The school is probably blocking any possible p2p traffic stright from their router(s). Utorrent and Azureus use "obfuscation" which encrypts and hides torrent traffic from isp's which may be throttling or slowing down suspected p2p software. It's called "traffic shaping" when an isp uses software that will recognize any p2p protocol and automatically slows your connection. P2p software that supports obfuscation must be enabled in the softwares settings first. Penalties are harsh so be careful. There are alot of free streaming video/music sites available which are great and are even better alternatives than using p2p.
"Go to Control panel - Network connections - Right click local area connections - properties - advanced - turn on the firewall then on the bottom go to setting - then add.." in the decription of service type "Azereus" then in the name or IP address "Type in you LAN IP" and for the "External and internal port" type the ports your using in Azereus.
To check go to Azereus - tools - options and it should say Incoming TCP Listening port and UDP listening port type that in LAN service setting.
i have this problenm in windows 7 all the firewalls turned off eg router, modem, pc and i still cant get no incoming connection works for me in xp but not in windows 7 so hopefully there is an update and the person above me is stupid. if your firewall if off you should get an incoming connection so turning on the firewall will not work even if you forward the port