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Dazzla_20011's avatar
Dazzla_20011
Icon for Nimbostratus rankNimbostratus
Apr 12, 2011

Difference between tcp and tcp half open monitor

Hi,     What's the difference between the a tcp and tcp half open montor?     I thought the Tcp monitor just checked the tcp three way hadshake and tcp half open just checked SYN-ACk is ...
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Chris_Miller's avatar
Chris_Miller
Icon for Altostratus rankAltostratus
Apr 12, 2011
TCP - Syn | Syn, Ack | Ack |

 

TCP-Half-Open - Syn | Syn, Ack

 

 

I can't remember whether TCP sends a FIN or a RST after the connection is complete but I'm almost certain Half-Open sends an RST after the Syn, Ack.

 

 

It's concerning that your application falls over from a simple 3-way handshake - at what interval are you checking?