>Found the following in /var/log/messages:
>---
>Dec 26 19:00:30 bsdbox inetd[12426]: warning: can't verify hostname: 
>gethostbyname2(melinet.maich.gr.36.218.193.in-addr.arpa, 2) failed
>---
>
>Is this an attempted break-in?

in this case it looks like the case of the admin who made a mistake
and left the trailing dot off a record in the reverse zone file.

193.218.36.5 maps to melinet.maich.gr.36.218.193.in-addr.arpa, which
should probably be simply melinet.maich.gr, which maps to
193.218.36.5.

-- 
|-----< "CODE WARRIOR" >-----|
codewarrior@daemon.org             * "ah!  i see you have the internet
twofsonet@graffiti.com (Andrew Brown)                that goes *ping*!"
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