Problem resroring from backup

I am a newbie here and to HA so treat me gently. Am trying to restore from backup on a bare metal HAOS Supervisor enabled system. Have done so before but now get the following error “BackupManager.do_restore_full’ blocked from execution, no supervisor internet connection”. How can I fix this?

Your supervisor can not resolve the internet resources it needs.

Is your HA machine connected to the internet?

What are your router DNS server settings?