12-06-2010
You're forcing your clients to use DOS? How do they even get on the network with DOS? Or do you mean Windows CMD?
I don't think you can force clients to change passwords over FTP. File Transfer Protocol is very simple and stupid, and doesn't have facilities to do much except transfer files.
Honestly, I have my doubts that you've succeeded in hardening the password. Windows commandline FTP doesn't support SSL last I check. Microsoft said they included an "ftps.exe" with IIS 7 but either forgot to do so or flat-out lied.
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LEARN ABOUT DEBIAN
poppassd
POPPASSD(8) POPPASSD(8)
NAME
poppassd - Password change server for Eudora and NUPOP mail clients
DESCRIPTION
poppassd runs from inetd and listens on TCP port 106 by default. Its sole purpose in life is to engage in short FTP-like conversations
from client applications and execute (or deny) remote password changes via the PAM facilities configured in /etc/pam.d/poppassd. The con-
versation looks something like this:
200 poppassd v1.8.4 hello, who are you?
user adconrad
200 Your password please.
pass foo
200 Your new password please.
newpass bar
200 Password changed, thank-you.
quit
200 Bye.
As can be seen from the example above, unencrypted passwords are transmitted over the network. Because of this, it is recommended that you
use this daemon only for local loopback password changing (for instance, from Perl, Python, or PHP web applications on the same server) and
block all non-local access to port 106, either via tcpwrappers (/etc/hosts.deny) or with appropriate firewall rules.
If sending unencrypted passwords over the wire doesn't bug you terribly much (as in the case of an ISP with hundreds of POP3 mail
accounts), this daemon can provide a simple way for some of your clients (those running mail clients that actually support this protocol)
to easily change their passwords.
FILES
/etc/pam.d/poppassd
Contains the PAM configuration for poppassd. By default on Debian, it merely includes the common-auth and common-password files,
which should work in most cases. If this doesn't cut it for your site, tailor to suit.
SEE ALSO
pam(7), inetd(8), hosts.deny(5)
AUTHOR
This manual page was written by Adam Conrad <adconrad@0c3.net> for the Debian operating system.
Debian 19 March 2004 POPPASSD(8)