I updated the windows server 2003 (Domain controller) and installed sp2. But after that no body can access the shared documents in fileserver and Domain controller. So i unistalled the sp2 and other updates and disabled the firewall . Now it is OK.
But in some fileserver (XP Sp2 using for sharing files etc) i can see question mark and numbers instead of the domain user's name in security Tab. So that no one can access it except domain administrator. I tried to add domain user's once again in the security tab. But can not. Please help me to solve this issue ?