300m connects as repeater, tethered or with wan ethernet but no internet

This device connects repeater, tethered or with wan ethernet but no internet is available, warning given when connection is established. The firmware is 4.3.18. This device was working fine. Is there a simple solution I can try? I have a few vpn connections which I don't really want to reconfigure after a factory reset. I have a backup of the current files from luci but I dont think that will include vpn data

The backups include everything, so even VPN data.

The message mostly indicates an DNS issue. Is DNS working? Does ping work?