I've got a server that running knoppix hdinstall, It works fine, no problems, but when I'm trying to connect to it with ssh from school I've got this "error" messege:

ssh_exchange_identification: Connection closed by remote host
I can use ssh everywhere else, but not at school. My school have not blocked port 22, I know that becouse I've got many friends at the same school who has servers runnings at their homes, and i works fine to connect via ssh to their servers.

Any suggestion?

(sorry for bad English)