System Crash while scanned by nessus or saint

Hi List, i've a suse linux box (7.3 Kernel 2.4.16) which is dying without console messages while scanning from a foreign host with nessus or saint, the last log message points always to "can not execute finger ...", a tcpdump shows always different (last) messages, for testing i've stopped inetd, ssh, apache,smb and so on but the host still dies, des anybody have a idea wha this could be ? I made an kernel update from 2.4.10 to 2.4.16 but other hosts with the same setup and kernel doesnt have tha prob ?? many thanks Matthias