I’ve had similar problems in the past - apparently no internet connection, and both times I narrowed it down to the machine being unable to resolve domain names.
Turns out Tailscale had changed the IP address for the machines’ DNS resolution in resolv.conf to 100.100.100.100
That’s fine when the machine is connected to Tailscale but not when it isn’t!
Reverting the DNS IP back to whatever it was previously, or to something like 1.1.1.1 solved the problem for me, at least to the extent that it could resolve URLs again.
I’ve had similar problems in the past - apparently no internet connection, and both times I narrowed it down to the machine being unable to resolve domain names.
Turns out Tailscale had changed the IP address for the machines’ DNS resolution in resolv.conf to 100.100.100.100
That’s fine when the machine is connected to Tailscale but not when it isn’t!
Reverting the DNS IP back to whatever it was previously, or to something like 1.1.1.1 solved the problem for me, at least to the extent that it could resolve URLs again.
Worth a look, if only to rule it out…?