[Samba] ntlm auth and AD uptime

[wpc]

i get a big problem with authentication popups (with
squid) when the connection to my AD dies. 

what options do i have to ensure less downtime when my
AD backend dies ? 
i would like something that for example caches the
users credentials , while testing for AD availability
before coming back online.

my setup is 
samba-winbind-3.0.20b-3.4
samba-3.0.20b-3.4
kerberos
windows 2003 server. 

  "Who the heck is General Failure, and why is he reading my harddisk?"
  


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