Si tu as lu l'aide tu devrais savoir :)
The /firewall
command
This command allows you to change the above
firewall settings.
/firewall
[-cmN[+|-]d] [on|off] <server> <port> <userid>
<password>
The -c switch clears the userid and password values.
The -mN switch set the connection type, where N is 4 or 5 for
Socks4 or Socks5, or p for proxy.
The +|-d switch turns dccs through a firewall on or
off.