we have some customer complains regarding a flow between a DB and Server crossing our FW. It involved 2 DB and several Servers, there are 2 VLANs connected to same FW.
When failover to FW-2, we noticed a lot of TCP-RESET (it takes arround 18/19 between RESET and last frame, you can give a look to delta time in my screenshot. In 2 min, arround 220 RESET.
It can happen suddendly, after 2 o 10 o 20 seconds, then DB o server send a TCP-RESET (TCP-RESET-ACK is received first as it looks like that's miss-ordered from my point of view).
Captures has been done on FW interface side... (I guess that should be better to have from DB and server side also...)
When running on FW-1, situation is OK, we didn't notice any TCP-RESET into the packet capture.