If you don’t use HTTPS, then there should be no certificate issues as HTTP is insecure and that is fine on a LAN. Double check all your network settings. Something may have changed there. Are you still on the same subnet as previously? Etc. Etc…
If you don’t use HTTPS, then there should be no certificate issues as HTTP is insecure and that is fine on a LAN. Double check all your network settings. Something may have changed there. Are you still on the same subnet as previously? Etc. Etc…