Dappnode has been running for months but suddenly I can’t open the UI. When connecting to the VPN it fails. When I open to get a new VPN file I open it in several browsers and they all say, “error decoding encrypted data. Error decoding key from base64. invalid encoding.”
NUCs usually can create their own network, acting as a hot-spot. In the DAppNode pre-installed NUCs we sell you can always access the DAppNode UI if you connect your laptop to the DAppNode WiFi, as show here. You should be able to do the same.
So I assume you have installed DAppNonde on a machine on your own, if you are not able to connect to your DAppNode anymore there are two different ways you can reach back your DAppNode:
Plug a monitor and a keyboar and mouse to your machine
Connect via ssh, if you do not know how to do that follow this guide
Once you reach your DAppNode, I recommend you to update your DAppNode to the latest version and reboot, to do that you just need to paste a command in the terminal, the documentation to do that can be found here: wget -qO - https://installer.dappnode.io | sudo UPDATE=true bash