What is the status code of that page? Is it actually an empty response, or does it just look blank in a browser?

When you access it from the internet, do you use an ip and port or a domain name? My first guess is that you entered the domain name somewhere in the config of either Opencloud or a reverse proxy, and the mismatch (between the expected domain name and the ip address used instead) is what causes trouble.

because /etc/hostname is allowed to contain only ASCII Latin characters, numbers, and dash

If you really wanna go for cursed, the syscall to change hostname doesnt have this restriction, and I do have a working system with non-ascii characters in the hostname. It takes some fighting with systemd and NetworkManager, and stuff does sometimes break, but it can be done.

I recommend the free tier of healthchecks.io for this. I have all of my in-depth monitoring selfhosted, but use this as a general "is it at least online" check that tells me on multiple platforms if it isnt.

This explains systemd versioning so well.

F12 just opens the developer tools as a whole, but there are also shortcuts to jump right to specific tabs (like the console or debugger, not just the inspector).

Not a clue, sorry. Ive never used nomadnet and dont know much about it.

stty: 'standard input': Inappropriate ioctl for device means that nomadnet needs to be started in a terminal. You probably want to either add the --daemon flag of nomadnet if you just want to run it in the background (ExecStart=/home/admin/.local/bin/nomadnet --daemon), or run it under tmux instead of systemd to be able to access the interface.

That was not scheduled maintainance, that was theit WaF and Workers dying. https://www.cloudflarestatus.com/incidents/lfrm31y6sw9q https://www.cloudflarestatus.com/incidents/k9ppxftx8bs5

I found it in the settings:

Under "Features":

Do you have any tool to help with that? Ive set this up in the past, but it was pretty hands-on namespacing to get it to work rootless.

Edit: For completeness, here is a script similar to what I use.

It does (not sure how well), but it seems to be a paid feature. Found under Settings -> Split tunneling.

The really simple setup for a single user is just a SSH server with access to storage and the git command. Assuming your laptop and desktop have SSH access to server, you can just:

ssh server git init --bare somerepo
cd somerepo
git remote add server server:somerepo
git push --set-upstream somerepo master #(or main)

and then git clone server:somerepo.

For something slightly higher-tech, I recommend going with Forgejo (the fork of Gitea). It is really easy to set up and low maintainance.

Avoid GitLab for small setups, it is fairly resource hungry.