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When i go to Firewall => States, I see the following:

Code Select Expand


int pro source nat dest State Rule
all udp 123.123.123.123:13331 10.132.0.17:13231 MULTIPLE:MULTIPLE let out anything from firewall host itself
all udp 123.123.123.123:13331 123.123.123.123:13231 10.132.0.17:13231 NO_TRAFFIC:SINGLE


One thing I can do to make a particular connection working, is to delete the state and hope for it to work.

This issue has become a problem and we are probably replacing the OPNsense Firewall Router with another Router.

I'm having a very similar issue.

udp port forward rule mapping some external WAN port to an internal LAN address.
in sessions: Instead of using the established connection the router tries to send the package directly out the WAN interface bypassing the OUTBOUND NAT, and not using the already established session.

I did the thing you suggested and it fixed it temporarily. But when the session dies I have the same issue again.

Something with connection tracking in the opnsense seams not to be working correctly.