Selfhosted
A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.
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How have you tested this? You need to use the external IP address of your router (public ip) to open it. And you need to test that from another internet connection. Also make sure the browser is actually trying to open an http connection to port 80. Some modern browsers / addons try to prefer https on port 443 instead and that wouldn't be reachable. Does a ping work? What's the exact error message? The port forward could be wrong. Needs to be port 80 (TCP) towards the internal device where nextcloud runs, to the port where it runs on that machine (could be 80, too). It could also be blocked by your provider, or your specific provider doesn't allow port forwards. Or you ran into issues with the shift to IPv6 addresses. Maybe your provider has some strange setup. Try if you can ping your router from external first. And try the canyouseeme.org mentioned in the other comment. That's good advice.
10.x.x.x IS an external adres yes? how do I check?
Sorry, 10.x.x.x is a private IP address range. That can't be reached from the internet.
Maybe try one of the services that display your IP like https://www.showmyip.com/ or the one mentioned earlier: canyouseeme.org , that one also shows your IP.
I have little info to work on. There are many different providers around the world with very different setups. Some are suitable for port forwarding, some arent. (You could sit behind a Carrier Grade NAT, which makes port forward difficult to impossible.) But you need to figure out your IP first.
All I can say, I run something like you describe... Nextcloud, a reverse proxy and a few other services. I did some port forwards, got a domain that points to my IP and it works fine.
Edit: I use YunoHost on my computer. Its a Linux distribution for selfhosting. I think its a good choice to get your feet warm or if you want a low maintenance setup. It includes Nextcloud and many other services.
But you have to figure out how to access your computer from outside. Either you get your IP and the port forward running, or you have to use a service like pagekite.net or you get a VPN running like almost everyone else here wants to convince you to use. I don't think a VPN is a good idea except if you only want to use it by yourself and not use all the collaborative features of nextcloud.
https://datatracker.ietf.org/doc/html/rfc1918#section-3