Spurious Retransmission to Server Behind pfSense NAT – Troubleshooting

lannat;pfsensetcpwireshark

i'm trying to connect to my ssh test server that i setup behind a pfsense firewall via nat on port 22.

When I sniff packet on my laptop (WAN side of pfsense) trying to connect to the server, SYN is send, SYN ACK received, but my computer don't care and resend.

Link to the capture : https://www.cloudshark.org/captures/996b00e33150

Have you got idea to keep debugging this problem ?

Thanks

Best Answer

Found it !

It's a bug when running pfsense virtualized -> https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=165059

Workaround is to disable hardware checksum offload box under System > Advanced on the Networking tab of pfsense.

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