> uhmm... SYN and FIN both set in the same packet? I'm pretty
> sure that is not a valid combination for tcp, so malformed packet ->
> likely hack attack..
Very common probe to see who is running a pop2 server, then if they get
an ACK check the server for an exploit with ipop2d which was shipped as
part of the imap package with Red Hat 4.x and Red Hat 5.x. I've also
seen very slow (every 9+ hours) incremental scans to this port
incrementing the IP in the subnet by one each time, rumour has it they
are scanning for a back-doored version of a fast RPC scanner known as
'b00ger' which adds an entry in your inetd.conf for a 'bOOger-rpc'
service on port tcp/109.
Systems & Network Administrator
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