Was the auth page straight up down? So http down? If so, something like PRTG can tell you when that's down. If it's a page up, but backend down in some way. No

Was the auth page straight up down? So http down? If so, something like PRTG can tell you when that's down. If it's a page up, but backend down in some way. Now that's a big question of what the code is doing. If perhaps auth is easy as a post request with creds and it returns with a success of some kind. Could be trivial to setup using python requests.