TCP Reset being dropped at firewall

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TCP Reset being dropped at firewall

L2 Linker



I have a client accessing a Citrix CAG via a firewall at one site on HTTP that I see traversing the FW, exist out towards the internal PA firewall reaches its destination.  The destination server is sending a TCP RST, we are told to redirect the browser to HTTPS, that TCP reset is sent all the way back to the firewall nearest the client, receive on the interface but the firewall drops it so the client never receives the TCP RST.


In detail....


Client (Internet IP) --- http ---> FW IP  [ FW1 VR 1 ] NAT Src Dst NAT --- route to VR 2 ---> [FW 1 VR 2 ] --> Over WAN -->  [FW2 VR 1 ] ---> Server


HTTP SYN sent and received at Server

Server sends TCP RST

TCP RST reaches FW1 on Rx capture

FW Drop capture logs all TCP RST to client


Can anyone advise why the PA drops TCP RST in such a scenario?


Thanks & Regards






Cyber Elite
Cyber Elite

Hi @GrantCampbell4 ,

Taking packet capture on palo alto will give you more clarity about the flow and what's happening..


L3 Networker

Please see my article for globalcounters, flow basic and pcap captures for such issues:

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