Client stuck in TCP SYN sometimes

Hi,

Best way to find out is:

• Do tcpdump on BIG-IP - something like

  tcpdump -nni -s0 0.0:p host [VS IP]

  - not sure if this will work, you can try

  tcpdump -nni -s0 0.0:p 'host [client 1 IP] or host [client 2 IP]'

• Issue

  watch -n 1 tmsh show sys connection cs-server-addr [VS IP]

Then you should see more or less what happens on BIG-IP when two clients are connecting to VS. Sure best option is do that in test environment where you are not processing thousands of connections.

But seems to be kind of bug, because you should get RST after Idle Timeout set TCP profile - except if you have Reset on Timeout disabled in TCP profile.

Piotr