Packet log: input DENY eth0 PROTO=6 207.218.223.135:4193 216.40.250.13:23 L=60 S=0x00

Any idea what those lines in /var/log/messages mean?
Code: 
Packet log: input DENY eth0 PROTO=6 207.218.223.135:4193 216.40.250.13:23 L=60 S=0x00 I=5157 F=0x4000 T=62 SYN (#42)
The server is regularly hanging-up, could that be the reason?

 

 

 

 

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