Wsus 3 0 sp2 clients not updating
showtopic=9134 Use ps Get SID from Sysinternals: You can run this against all computers in your domain to discover who has a duplicate SID.
You should really then run New SID from Sysinterals on any of the duplicate computers to resolve any potential issues in the future (not to mention the security issues involved with having duplicate SIDS on the network): You don't need to RUN New SID on each computer prior to fixing the duplicate ID issue in WSUS, but it may rear its ugly head later on, so if you can find the time, I would recommend fixing this issue as soon as you can.
Some questions to ask yourself: Some symptoms of this may also include computers randomly disappearing/reappearing from/into your WSUS console. Another symptom is the computer will receive updates, but not report into the server properly (if at all! Each computer on a network requires a SID (Security IDentifier), which uniquely describes that computer account to the rest of the Windows network resources - supposedly not as big of an issue with computers in a domain environment as it is with workgroups.