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Group Policy - Unknown SID's

In Default Domain Policy : Computer Configuration-->Policies-->Windows Settings-->Security Settings-->Local Policies-->User Rights Assignment we have many policies with unknown SID's. All of them begin with *S-1-5-21. Are these unknown SID's safe to delete from the policy or are some of them actually being used somewhere and they are just not resolving to a User or a Group.

Plan is to back up the Default Domain Policy, delete the unknown SID's, do a gpupdate /force, and then reboot clients,

So I'm looking for any of the gotcha's in this, really would like to clean this up...

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Vince Glisson
Asked:
Vince Glisson
1 Solution
 
Keith LangmeadCommented:
It doesn't really answer your question, but have a look at http://support.microsoft.com/kb/243330 which lists all the commonly known SIDs and may allow you to identify what the group is for.

From the document all the S-1-5-21 SIDs appear to relate to various default domain groups, for instance Domain Administrator, Domain Users etc, but the crucial info comes after the bit you listed. If the domain part of the SID is different to your current domain then perhaps they relate to an old domain that was part of it in the past and no longer there, or perhaps there's an actual issue with AD such that those names are unable to resolve (in which case I'd suggest you need to fix that, not just delete the groups).
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Vince GlissonOwnerAuthor Commented:
The well known SID's all end with a 500 series number as in S-1-5-21-domain-500 , 501, 502 etc...

The SID's i have all end with 4 digits -3326 thru 3346 so there are 20 unknown SID's in one policy (logon as a service).

There are so many i wanted to ask the Experts before i attempted a clean up...

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Liam SomervilleSenior Security ConsultantCommented:
I'd suggest the following:

1. Try manually resolving SIDs to Users/Groups (http://technet.microsoft.com/en-us/library/ff730940.aspx)
2. Get your hands on a blank Default Domain Policy. I've attached one, but you may want to spin up your own VM and pull a report.
3. Remove the unresolved SIDs, readd users/groups if required, or otherwise mirror your Default Domain Policy.
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