Can't login after Lion upgrade

i two went from snow leopard server to lion server and my admin password no longer works. i tried this fix, but terminal tells me the following:

Password:

smedvin is not in the sudoers file. This incident will be reported.

i'm really at a bit of a loss here, i can't change settings on my network or install any software... anyone help?

Just installed Lion on a MacBook Pro, which was running the latest Snow Leopard version.

Unfortunately for me neither resetting the password from the Snow Leopard Install CD nor from the Recovery HD of Lion works. I changed the passwords of all user accounts successfully but when trying to logon after reboot: no chance.

My Mac was assigned to windows domain. Maybe this is a problem? I upgraded my iMac without any issues...

I had a similar problem. To get Snow Leopard to work with some features (in our case printers) in a window environment, many IT departments use AdmitMac. Older versions are not compatible with lion and those of us that upgraded without first removing AdmitMac were unable to get back in. Did you have that running?

Hi mjlmobile,

thanks! That seems to be the problem! I don´t use AdmitMac but Centrify. However, I just found the note that Centrify has to be upgraded first before upgrading Mac OS X.

Bad luck, since now I cannot install Snow Leopard again on the maschine without formatting the disk and setting everything up from scratch...

Thanks anyways for the hint!