Connection Issue

[UnholyDecimator]

Server has necessary ports forwarded both through firewall and router.
Server has public IP.

Up until this point, there have been no connection issues.

I could connect from my home, friend who lives far away could also connect no problems.

But here's he weird thing,

From my school:

Cannot connect to server.
Can connect to web admin.

Help, advice?

Edit: I'm guessing it may be a security feature of the school or something wonky with how the networks are interconnected....