For some reason i cant host levels anymore when i strt to host a duel they say its pinging. even if they try again and the server,s already up:S

Conection: adsl
Version of Jazz2: Both
how i starded server: just with jj2 i also tried with xjj2
How they join: jazz2 9dont work )
How they join: jazztool, xjj2 ( WORKS but not evreyone has it )

Please help me.