RH 8.0.

For reasons that are not immediately relevant, I changed Authentication settings through the GUI, including turning on Kerberos. I may have made other changes in Authentication as well, I can't remember. My thinking at the time was... "I can add the additional authentication methods, and nothing else will really change". Brilliant.

When I rebooted the system I found one significant change. I have 2 logins plus root on this machine, and none of them will work either within the GUI or from the prompt. (I have managed to make my computer very secure, even from myself. From one perspective, this may be a good thing as it prevents me from making any other dumb changes to my system.)

Does this make sense so far?

Here is possibly some good news. I can still access GRUB with my root password. So, if I knew what to do with it, I probably could make a lot of changes to my system, maybe even break in. Suggestions welcome.

Thanks,
Jeff

OK, I figured out how to boot as single. I have root access, and I seem to be able to set the root password with passwd command. However, when I boot to the full system, I still cannot login as root (or anything else). Weird, eh?

I found the docs for authconfig, ran it from the single boot and turned off support for LDAP, Kerberos and SMB. Voila, back in business. Login works.

I guess I don't need a Linux guru after all... just a lot of spare time to figure things out.