I really think you have conflicting resolvers running on startup, which would explain this. Double check your systemd units that are enabled on boot. If you don’t see anything like networkmanager, reboot the machine, get the status of systemd-resolv to make sure it’s actually running after a fresh boot, check the logs and see if you see anything interesting there, then restart it and check the logs again once DNS works. Something is different between those two actions.

See if this helps at all:

sudo systemctl revert systemd-resolved
sudo systemctl restart systemd-resolved

Also, what does ls -lh /etc/resolv* show?

What’s happening in journalctl -u systemd-resolved?

Well only your DNS is broken, so that’s all that needs to get fixed. Are you POSITIVE you’re using systemd resolve and not networkmanager?

Did you insert the sysctl values and reboot?

Synology sells single bay units now, but anything that has network connectivity should work fine. If this is just off-site backup, find whatever is the cheapest. If an RPi with a USB attached disk is cheaper, do that.

You can find MiniPCs of all sorts really cheap now, though almost all have smaller onboard SSD storage.

There’s a difference between KISS and just plain useless. These apps are like beginner code for people in high school.

Just GTFO if you don’t want help. Later.

Like everyone else is saying. POST CONFIGS.

I don’t think you changed them in the right way, or didn’t restart. Post configs.

Details please.

I’m assuming you forced a port conflict somehow.

OnlyOffice is probably going to be your best bet.

Just kinda flipped through his guide. It’s a bit dated on knowledge and techniques, even for beginners.

You don’t need a computer for a router. Get a router that ships with OpenWRT and start there. GL.iNet makes good and affordable stuff. Use that for your ad blocking, VPN, and so on to get started.

I’d just skip OpenVPN altogether and get started with Wireguard or Headscale/Tailscale.

If you want to run other heavier services, start out with a low-power minipc until you’re settled on what your needs or limitations are. You can get a very capable AMD minipc for $250-300, or an n100 low-power for a bit cheaper. Check out Minisforum units for this. Reliable, good price, and solid warranty.

If you deal in heavy storage, maybe consider adding a NAS to the mix, but maybe that’s a further steps. OpenWRT is a good starting point just to get your basic network services and remote access up, then just move on from there.

A good and fun starting point for some people is setting up Home Assistant on a minipc or Raspberry Pi (honestly, the costs of Pi boards now is insane. Might be good just to get the minipc).

A breakthrough in physics that enables a new technology to have all the benefits and zero downsides of our current globally deployed communication standards. Like true wireless energy, or something that can replace undersea cables.