NNTP and Yahoo IM conflict

[NTR <ntr () intoto com>]

Hi All,

I am trying analyze NNTP traffic and i have created a profile for NNTP 
protocol.  It's a kind of NNTP protocol anomaly detection.
I have also observed some time Yahoo Instant Messenger uses NNTP 
port.  Though it is using NNTP port the format is quite different
from NNTP protocol.  It is the point where my parsing engine facing 
problem.  Each time whenever yahoo connects on NNTP port
my parsing engine treats it as NNTP protocol anomaly and start generating 
alerts.  I am looking for some advise or solution to solve
this problem.  how we should profile NNTP protocol so that it can 
differentiate yahoo traffic from the genuine NNTP traffic.

Thanks and anticipating early solutions.

Thanks and Regards,
NTR 

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