Just searched on Google for you. 
http://www.robertgraham.com/pubs/firewall-seen.html is a great site on what is 
hitting your firewall (what ever port number) by the looks of it. It says the 
following about port 13223

Hope that helps

Justin

13223                  The "PowWow" chat program from Tribal Voice. It allows 
users to open up private chat connections
                            with each other on this port. The program is very 
aggressive at trying to establish the connection
                            and will "camp" on the TCP port waiting for a 
response. This causes a connection attempt at
                            regular intervals like a heartbeat. This can be 
seen by dial-up users who inherit IP addresses from
                            somebody who was chatting with other people: it 
will appear as if many different people are
                            probing that port. The protocol uses the letters 
"OPNG" as the first four bytes of its connection
                            attempt. more 

Justin Hall (BSc, CNA)
Computer Support Officer, St Stephen's School
Ph: +618 9243 2150 Mob: +61409 119 131

>>> Ethan Benson <[EMAIL PROTECTED]> 12/10/00 14:11:31 >>>

Does anyone know what port 13223 is?  today i have been getting a
massive number of connection attempts to that port from several
different addresses.  

-- 
Ethan Benson
http://www.alaska.net/~erbenson/

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