We have a 4800 pair running R75.40 GAIA. Here is the setup we have
Server has the idle session timeout value of 900 seconds and it is sending a reset packet after it doesn't see anything in the 900 secs. Fw3 , Fw2 is closing the connection after they see a reset packet but fw1 is not removing the entry from connection table.
As source has received the reset packet, for all new connections it it will start with a tcp 3 way hand shake. Now the issue is when Fw1 sees syn packet, it is converting it to ack (smart conn reuse). But fw 2 is dropping the ack packet as it has no entry in its conn table(as it is expecting syn).
The issue is intermittent on fw1. Is it a bug on R75.40 Version.
We have default tcp timeout value.