I'm back after a comedy of errors for my little Raspberry Pi, where mastodon have lived for a few years.
3 things pretty much happened at the same time. The router that the Pi lives behind, got an update that threw the settings that pointed to the pi out of sync.
Something cause the nginx server to fail to load problery and therefore gave 502 error and other timeouts.
And last but not least the free dns service, I had running pointing to the pi, stopped sending http trafic to the Pi, where telnet, wget and ssh etc happily were pasted onwards when I wanted to play with sudomakecake.ddns.net.
Hence, the update to a VPS and https://sudomakecake.com, since the Pi struggled with updating mastodon and the traffic over wifi. Now its retired to IRC and backup duties which should result in less faff/stress/downtime for me.
Sadly I looks like I have lost access to the old install and therefore can't get my posts or followers and followings in a easy way, so have to build it up manually.