After I Installed shadow passwd, on Linux, I was unable to login from a remot (or localhost) ftp session. After entering the password, It returned a Login Incorrect. I upgraded the wu-ftpd-2.4-fixed ftpd program and followed the how-to.
Also the paths got messed up. shutdown, or init commands do not work from root / #.
Regular logins and telnet logins work fine.
I hope this is enough info.