I've been using the OPNSense plugin for Caddy for a little while now, still working out some of the kinks on my system but today I ran into a new one.
I had a device referenced by https://pikvm.example.com which had been working well for at least a week now, maybe two.
However, this morning I could no longer access it via https://pikvm.example.com as I could as recently as yesterday. Regardless, I could access via http://xxx.xxx.xxx.xxx (its IP v4 address). Also, I could ping it just fine at its IP v4 address.
After some digging, I realized I did not have the device assigned to a static IP v4 address in OPNSense on the page Services: ISC DHCPv4: [LAN]
I assigned a static IP address to it, and vola it was working again.
Just thought I would share.