Luckily I found this topic.

New GL-AXT1800, facing EXACTLY same issue.

WG server is operational, same config exported to mac client works without any issues.

What I have tried:

  • replace server hostname with IP to exclude DNS related issues;
  • change VPN settings on AXT-1800 as some advised in the thread.

So far nothing helped, I am still getting REKEY-TIMEOUT.