group RIDs (Modem_Users)

Luke Kenneth Casson Leighton lkcl at
Tue May 5 10:03:47 GMT 1998

On Mon, 4 May 1998, David Bannon wrote:

> At 22:58 30/04/1998 +1000, Luke Kenneth Casson Leighton wrote:
> >On Wed, 29 Apr 1998, various people wrote:
> >
> >> If so, sould someone post a list of some of the more popular group RID's 
> ..
> >> i already have the list from winnt.h,
> >> but i was not aware that there are more: things like "modem users".
> ..
> >> add "domain groups = the RID" in the smb.conf
> getsid.exe tells me :
> The SID for account BIO-LAB\Modem_Users is
> S-1-5-21-871122656-1776954347-317593308-1004
> Now, I have to ask, which RID (of the last four) should be mentioned in the
> smb.conf file ?

last one.

> I have checked winnt.h and Modem_Users are not mentioned,

i find this strange.  you didn't create the group "Modem_Users" yourself,
did you?

> I don't
> understand why there are four RIDs after the S-1-5-21- bit. The MS
> Developer site does not seem to list anything, could it be that these
> numbers are madeup on the fly and therefore will be different on every
> system ?

the S-1-5-21-87xxxxx-177xxxx-31xxxxx is the SID for the domain.
concatenate this with a RID and you have a worldwide unique method to
identify a user / group / entity.


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