I’m also having this issue. Could it be related to having run two dappnodes on the same network? I’m pretty confident that I disconnected the ethernet before reconnecting. I’ve tried resetting the computer and dappnode to no avail.
Use Wireguard
Go to local dappnode UI [http://my.dappnode/#/vpn/wireguard/], Under VPN click “Get Link”
Copy the Credentials given by the VPN profile, note you will be copying the remote VPN.
Install Wireguard on PC / Mobile
Add Tunnel > Add Empty Tunnel > CTRL + A > CTRL + V
On Wireguard connect to the Tunnel
On browser try accessing the apps you are trying to.