Hello Ramin and Daniel, thank you for the information, I will read the RFC then I will try to block on the firewall, I will be giving more information to the list. Regards, Geffrey RD> On Tue, Jul 15, 2003 at 12:36:16PM -0700, Daniel Chemko wrote: >> >> How about the fact that these packets are for T/TCP aka Transactional >> TCP, not regular TCP! RD> Yes. There must be something about T/TCP packets that prevents it RD> from being matched by a regular "-p tcp" option. I don't know much about RD> T/TCP but reading rfc1644 might help at least block them on the firewall. RD> Ramin -- Best regards, Geffrey mailto:g_netfilter@xxxxxxxxxxx