I'm not sure if this is a crazy bug or something bad happened.

So one of our admin team members had to change his windows password. Once that person did this they wasn't able to log into Service Desk on Sunday. So they figured they needed to wait until Monday for the import from AD to happened. Monday comes around still a no go. I get to work Tuesday and I also can not login as well. Found out Tuesday no one in the org can login as well. Today I'm asking for assistance.

Has anyone heard of or seen this type of problem?

We've tried restarting our servers and still nothing. Hard to figure out the issue since we can't login.
Is there any alternatives in logging in?

Any type of help is welcomed.