Hi Kai,

> Flags: SYN: 1 FIN: 1 ACK: 0 PSH: 0 URG: 0 RST: 0

What is unusual here is that both the ACK and the FIN flags were set. This 
never happens during a regular TCP/IP connection. 

So someone was most likely sending manually crafted packets your way, or 
using some kind of security auditing tool.

I don't want to bore you with the details. If you're interested you can read 
them up here: 

http://www.cs.cornell.edu/courses/cs414/2001SP/lectures/TCPIP.pdf

-- 

With best regards,

Michael Stauber
[EMAIL PROTECTED]
Unix/Linux Support Engineer
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