Hello List, Just I have seen the graphics of my server with MRTG. This fu..... crackers. My system is stable but the trafic is very high. The rules with udp/tcp - 1433/1434 does blocking the unicast traffic but also multicast trafic comes in and I don't know what can I do against this. It seems to be the MSSQL-Worm on a multicast adress. List, have anyone any idea? Many thanks.... Mario PS: tcpdump> 217.175.233.161.1181 > 224.41.16.185.1434: udp 376 I have inserted following rules to SuSEfirewall DROP all -- 0.0.0.0/0 224.0.0.0/8 DROP all -- 217.175.233.161 0.0.0.0/0 DROP udp -- 0.0.0.0/0 0.0.0.0/0 udp dpt:1433 DROP udp -- 0.0.0.0/0 0.0.0.0/0 udp dpt:1434 DROP tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:1433 DROP tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:1434