[Samba] Linux/AD authentication stops working after ~5 minutes

[Adam Nielsen]

>          password server = vmdc1.domain.local

AFAIK this option is only required for security = DOMAIN - if you're
using security = ADS then when you join the domain Samba/winbind will
find out which server to use for passwords.  I also think you will need
Samba running to 'maintain' the connection to the domain - although if
you can run "net ads testjoin" without smbd running then I guess it
shouldn't matter.

Cheers,
Adam.