I am getting sid's instead of user names in the security permissions.
Some folders I can see the user names in the security permissions.
Some folders I just see the SIDS in the security permissions.
In Share permissions I can see the user names all the time.
The problem is in a Windows 2008 R2 as a file share.
I have an identical file server (same shares) in Windows 2000 and it is perfect
Dns is ok
Security channel is Ok
Firewall is turned off
UAC is disabled
Disabled IPv6 on the 2008 terminal servers: http://support.microsoft.com/kb/929852
Disabled TCP offloading, RSS and NetDMA on both 2008 R2 and 2003 servers : http://support.microsoft.com/kb/951037