Wireguard S2S broken

[QuisaZaderak]

Hi,

I upgraded today from 2026.1.11_10 to 26.7
Since the upgrade my WireGuard setup connecting my home OpnSense with my Azure OpnSense does not come up again.

In error log of WireGuard there is following new entry:

2026-07-16T18:31:17Errorwireguard/usr/local/opnsense/scripts/wireguard/wg-service-control.php: The command </usr/bin/wg syncconf 'wg0' '/usr/local/etc/wireguard/wg0.conf'> returned exit code 1 and the output was "Name does not resolve: `xxxxxxxx.spdns.org:51820' Configuration parsing error"

I tried to recreate the entry but still get this error.

[Patrick M. Hausen]

Try using an IP address instead of a DNS name. Name resolution is problematic with WG. It does it only once at startup.

I try to avoid depending on DNS for S2S VPN in general.

[franco]

We added https://github.com/opnsense/core/commit/67ea4ad76c96 to 26.7, BTW.  I'm happily awaiting feedback on this.


Cheers,
Franco