WireGuard client on opnsense cannot connect to the server after 25.1

[llek]

Hello, apart from many other broken things, such as the temperature sensors on my install.
The WireGuard client is completely broken, and is unable to connect to the server. I am able to connect to the server behind the firewall from my PC, but opnsense is not.

There is nothing in the logs, and apparently WireGuard is sending packets, but the server is not responding. This is not the case on my PC, with the same exact config. And no, I am not trying to connect from my PC and from OPNsense at the same time.

Here are wireguard logs:

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2025-01-30T12:04:45 Notice wireguard wireguard instance AT-VIE2 (wg0) started
2025-01-30T11:57:55 Notice wireguard wireguard instance AT-VIE2 (wg0) started
2025-01-30T11:57:55 Notice wireguard /usr/local/opnsense/scripts/Wireguard/wg-service-control.php: plugins_configure monitor (execute task : dpinger_configure_do(,[AT-VIE2v6,AT-VIE2v4]))
2025-01-30T11:57:55 Notice wireguard /usr/local/opnsense/scripts/Wireguard/wg-service-control.php: plugins_configure monitor (,[AT-VIE2v6,AT-VIE2v4])
2025-01-30T11:57:55 Notice wireguard /usr/local/opnsense/scripts/Wireguard/wg-service-control.php: ROUTING: setting inet6 default route to fddd:2c4:2c4:2c4::1
2025-01-30T11:57:55 Notice wireguard /usr/local/opnsense/scripts/Wireguard/wg-service-control.php: ROUTING: configuring inet6 default gateway on opt1
2025-01-30T11:57:55 Notice wireguard /usr/local/opnsense/scripts/Wireguard/wg-service-control.php: ROUTING: setting inet interface route to 10.7.0.1 via wg0
2025-01-30T11:57:55 Notice wireguard /usr/local/opnsense/scripts/Wireguard/wg-service-control.php: ROUTING: entering configure using opt1
2025-01-30T11:57:55 Notice wireguard wireguard instance AT-VIE2 (wg0) can not reconfigure without stopping it first.
2025-01-30T11:56:05 Notice wireguard wireguard instance AT-VIE2 (wg0) started
2025-01-30T11:46:35 Notice wireguard wireguard instance AT-VIE2 (wg0) started
2025-01-30T11:46:35 Notice wireguard /usr/local/opnsense/scripts/Wireguard/wg-service-control.php: plugins_configure monitor (execute task : dpinger_configure_do(,[AT-VIE2v6,AT-VIE2v4]))
2025-01-30T11:46:35 Notice wireguard /usr/local/opnsense/scripts/Wireguard/wg-service-control.php: plugins_configure monitor (,[AT-VIE2v6,AT-VIE2v4])
2025-01-30T11:46:35 Notice wireguard /usr/local/opnsense/scripts/Wireguard/wg-service-control.php: ROUTING: setting inet6 default route to fddd:2c4:2c4:2c4::1
2025-01-30T11:46:35 Notice wireguard /usr/local/opnsense/scripts/Wireguard/wg-service-control.php: ROUTING: configuring inet6 default gateway on opt1
2025-01-30T11:46:35 Notice wireguard /usr/local/opnsense/scripts/Wireguard/wg-service-control.php: ROUTING: setting inet interface route to 10.7.0.1 via wg0
2025-01-30T11:46:35 Notice wireguard /usr/local/opnsense/scripts/Wireguard/wg-service-control.php: ROUTING: entering configure using opt1
2025-01-30T11:46:35 Notice wireguard wireguard instance AT-VIE2 (wg0) can not reconfigure without stopping it first.
2025-01-30T02:00:19 Notice wireguard wireguard instance AT-VIE2 (wg0) started