Help with Linux offline cached credentials on a Windows domain

[blu-Z8efaSeK1ezqlBn2x/YWAg at public.gmane.org (Edward Ned Harvey)]

> From: discuss-bounces-mNDKBlG2WHs at public.gmane.org [mailto:discuss-bounces-mNDKBlG2WHs at public.gmane.org] On
> Behalf Of Scott Ehrlich
> 
> I have modified the native config files both Ubuntu and CentOS systems
> (laptops) to allow them to be added to a genuine Windows Active
> Directory domain.
> 
> When on the network logins work fine. ? Take the systems off the
> network, and the user, even though their credentials are cached,
> cannot log in.

How are you doing this?

May I suggest Likewise? 
Here are my installation notes on Ubuntu:

http://www.likewise.com/community/index.php/download/

Make the file executable.  Run it as root.
It will tell you how to join the domain.  Do it.

/opt/likewise/bin/domainjoin-cli join domainName ADjoinAccount
    Username must be in the form DOMAIN\username
    On the command line, you must use the escape char:  DOMAIN\\username

Edit your /etc/likewise/lsassd.conf
    login-shell-template = /bin/bash
    homedir-template = %H/%U
    (repeat for 2 separate lines that say homedir-template)
    assume-default-domain = yes

Reboot