Port 18593 attacks

During the past week my Frazier Firewall has been turning away thousands of 
attempts at port 18593.  Some times as many as 245 in one hour.  In the past 
when I had a large number of hits on one port, I could find something about 
it from Symantec or some forum on the web.  This time no-one is reporting 
anything about port 18593.

It seems to be overwhelming the firewall logging facilities as the daily email 
only reports the last six or eight hours.

Anyone have any clues about this? 
bruce


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