I just changed my login shell to bash, and now I can't FTP into my machine. Why not?

You must add the full pathname to bash to the file /etc/shells.  As

noted in the answer to the previous question, many systems require

this before you can make bash your login shell. 



Most versions of ftpd use this file to prohibit `special' users

such as `uucp' and `news' from using FTP.