When I try to use passwd to change a user's password I get the following result every time:

[root@www ~]# passwd username
Changing password for user username.
New UNIX password:
Retype new UNIX password:
passwd: Authentication failure
[root@www ~]#

This only occurred after I upgraded from FC2 to FC3 and migrated all my /etc/passwd and /etc/shadow over from backups I had.

What is wrong? I think it's something with PAM, but I'm not sure. Every user has a /etc/passwd and /etc/shadow entry. authconf is setup to use MD5 and Shadow passwords only.

the same occurs to me in a flesh install. I still have no clue what's going on here

I finally gave up on it and went back to FC2. Everything works fine, now.

Another problem with FC3 I ran into was with my USB HP DeskJet 960c. After installing the latest kernels for FC3, it would hang on kudzu during bootup. Anyone else had similar problems with FC3?

fwiw, if you turn off selinux in the system-config-securitylevel applet and reboot, it works. alternatively, you can put selinux=0 on the kernel line in /etc/grub.conf

unfortunate, but i get the impression that selinux polices aren't quite cooked for general usage yet.

I'm not infront of the machine right now, but my selinux is set to warm only. Also, I installed a few minutes ago Webmin and I was able to change the passwords throw webmin.