For password, type in your kerberos passowrd. Check the save password box if you don't feel like typing your password every time you log onto Michnet. Now type in the phone number you would like to use to connect to Michnet. It will make a bunch of noise and then say verifying user name and password. First, your password is incorrect.
Re-type it to be sure.
If it's still not working, call the accounts office to change it. Second, the authentication server is busy. There are enough phone lines to support all the users in the area, but the computer that makes sure they are UofM users is too slow to handle all the requests, so it can drop you back to that password screen. It's best to hit enter a few times with a blank password and then try your password if this happens. If not, wait until it's real late at night or real early in the morning to connect.