The Suse kernel 2.4.2-4GB enables CONFIG_INE_ECN (Explicit congestion notification). As the configuration help says: "... many broken firewalls which refuse connections from ECN-enabled machines." The problem is solved by recompiling the kernel with this option disabled or at runtime by: echo 0 > /proc/sys/net/ipv4/tcp_ecn Best regards Odd Arild Olsen oao@tux.magcom.no MagCom AS Oksenøyveien 10 C N-1366 Lysaker Postboks 240 N-1326 Lysaker Tlf +47 67 81 92 48 Faks +47 67 81 92 10