Interesting log entry

[stayler]

Hi Guys,

One of my firewall boxes has had several of these errors show up in
/var/log/messages.  Its coming from 2 or 3 different IP's.  Would
anyone have an idea as to what I am looking at, or what else I should
look for?

stayler

Begin quoted text++++++++++++++++++++++++++

Unusual System Events
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Oct 29 17:34:49 gw in.identd[15835]: reply to 209.126.166.144: 61536 ,
25 : ERROR: UNKNOWN-ERROR