You might also want to dump the packet and read the contents of it. The error-code is followed by a textual message tht sometimes (ha) say more the just the code (and that message I think you are getting i error 20). tcpdump -w /tmp/foo -s1500 'filter to cache packet' [caught packet] ^C less /tmp/foo # (or strings /tmp/foo | less) is usully what I do. Love