SOL 5089 - Disabling default PCP F5 setting to correct Server Time-wait issue

I have a new application and what I am seing is that the F5 closes the TCP session and the Server also responds to close the session (Fin/ fin-ack/ ack) in both directions. However the F5 tries to use the same source TCP port to connect to the server and the server does not respond and issues occur. When we disabled "preserve client setting" global parameter on F5 the issue went away. We are also using fast L4.

 

 

Issue with default PCP (preserve client Port)setting on F5

 

-------------------------------------------------------------------------------------

 

server <------------SYN-----------F5 Source port 42282

 

server------------Syn/Ack-------->F5

 

server<------------ACK------------

 

 

Then the session closes normaly with FIN/Fin ack / Ack in both directions

 

 

Then SYN keeps going out with same newly closed TCP source port but server does not respond..

 

 

Server<----------------SYN-------------F5 Source Port 42282

 

Server<----------------SYN--------------F5 Source port 42282

 

 

By disabling the PCP Global setting all is now working. This was done using bigpipe command ""bigpipe db TM.PreserveClientPort Disable""

 

 

Any issues with leaving this as is or are there apps that require the same source port?