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fanttazio_23961's avatar
fanttazio_23961
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Jul 18, 2016
Solved

TCP reset connection with MSSQL

Hello all, Disclaimer: I'm not an F5 expert and just started working and learning it so apologies in advanced if I say something that doesn't make sense or wrong. The issue: We are doing SSL offl...
application delivery
BIG-IP
LTM
  • fanttazio_23961's avatar
    fanttazio_23961
    Jul 18, 2016

    OK. I think I've found my answer. This should be the monitoring mechanism by the F5:

     

    Monitoring section on https://support.f5.com/kb/en-us/solutions/public/9000/800/sol9812.html

     

    The tcp_half_open monitor performs a simple check on the pool member service by sending a TCP SYN packet to the service port. When the monitor receives the SYN-ACK packet from the pool member, the monitor considers the service to be up, and sends a TCP RST packet to the service instead of completing the three-way handshake. The TCP RST packet is typically sent on the server side of the connection, and the source IP address of the reset is the relevant self IP address of the VLAN.

     

fanttazio_23961's avatar
fanttazio_23961
Icon for Altostratus rankAltostratus
Jul 18, 2016

OK. I think I've found my answer. This should be the monitoring mechanism by the F5:

 

Monitoring section on https://support.f5.com/kb/en-us/solutions/public/9000/800/sol9812.html

 

The tcp_half_open monitor performs a simple check on the pool member service by sending a TCP SYN packet to the service port. When the monitor receives the SYN-ACK packet from the pool member, the monitor considers the service to be up, and sends a TCP RST packet to the service instead of completing the three-way handshake. The TCP RST packet is typically sent on the server side of the connection, and the source IP address of the reset is the relevant self IP address of the VLAN.