Deny TCP reverse path check

You will have to take a tcpdump in the F5, and check what actually happens.

To check in the tcpdump:

• Who terminates the connection?

   

• Does the connection closes fully in the client side?

   

• Does the connection closes fully in the server side?

   

A common problem related with termination in a TCP connection, is the time wait settings. I would guess that is that case here, but you need the tcpdump to confirm, with the settings from F5 and back end server. I saw this in the past with Windows servers, here is the link for Windows:

https://technet.microsoft.com/en-us/library/cc938217.aspx