the Microsoft default network setting "using LMHOSTS"
sometimes blocks dns requests,
so that multiple problems can occur.
me and my technicans always deactivate this setting
if we rollout clients and server running microsoft operating systems.
a few weeks ago i got a call, that an adminisrator is not able to change network security permissions on network shares
any more.
the domain field is missing if he tried to add active directory user accounts.
the solution was in deactivating the lmhosts setting, too.
then did "ipconfig /flushdns" and open the security settings of the sahre again.
the add field contained the ad groups directly without rebooting...
on the client side it´s also possible that no internet connection
starts (without proxy server),
cause dns resolving fails.
and a lot of other bugs...
deactivate lmhosts in order to circumvent such problems...