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I solved my issue by deleting the wg0 interface, disabling wireguard, edited the configuration file to set the wireguard instance from 0 to 1, and reassigning a new wg1 interface. I think there may have been an interface group definition problem such that wg0 was not part of the group, and therefore the floating firewall rule that allowed access to/from that interface didn't properly apply.

I upgraded to 24.1_3 from 23.7 and immediately experience wireguard problems. No connections worked, no handshake. My wireguard logs showed this entry whenever I restarted the service.

I'm having an issue where after an update I am able to get handshakes but no traffic routes. I hadn't changed configuration, so I assume the update broke something.

It appears that wireguard traffic from opnsense to client is severely curtailed for some reason. e.g., I see 156 bytes transferred from opnsense to client, but much more (and it ticks upward) from client to opnsense. The trick from early in the thread to restart the wireguard process did not change that behavior for me.

Looking through the firewall rules, I don't see anything specifically referencing either the wireguard IP pool nor the interface, so I suspect that there was some automatically-generated rule that is no longer being automatically generated.