I created a game with a online score table connected to db from internet hosting with ajax.
This table in my pc, in other pc in my house and in othet pc in other house works fine, the game connect to internet, but when y try to run the game in a school the game not connect to internet.
Whats is the problem?. The firewall?,
Hard to say, but school IT dept should always keep a tight reign on what enters and exits their network, for obvious security reasons. You could always ask them.
What does the browser console messages tell you? Any errors shown?