How come i can't add a domain user?

how come when i try to add a domain user/group i get this error:
Error 15401: Windows NT user or group 'MYDOMAIN\Domain Users' not found.
Check the name again.Hi,
See the reply from Bill from a old postregarding the same issue.
Hi Biva,
I see this is a complex problem as usually the suggestions should work.
The Enterprise Manager will use sp_grantlogin to grant permissions. When we
use sp_grantlogin to grant the permissions to a NT User, the stored
procedure calls
LookupAccountSid function and that function looks in the SID cache on the
local
computer before it goes to a domain controller. If the SID in the cache is
incorrect, then the problem would occur. This problem may occur if we
rename the User account. As far as I know, the only method is to reboot the
computer. However, you may check with Windows 2000 newsgroups for
suggestions, e.g. microsoft.public.win2000.gener­al,
microsoft.public.win2000.activ­e_directory.
In addition, this indicates that domain names are not resolved properly.
Please check in Administators Group in Computer Management. If domains
accounts that are members 'ARE NOT' showing up like this,
domain\account
Instead, they show up as a long string of numbers, then it indicates that
it is not resolved properly. Please check with Windows 2000 newsgroups to
see if they have any suggestions.
This posting is provided "AS IS" with no warranties, and confers no rights.
Regards,
Bill Cheng
Microsoft Support Engineer
Thanks
Hari
"James" <See.My.Sig@.The.Bottom.com> wrote in message
news:s1wIe.13389$Bx5.11303@.trnddc09...
> how come when i try to add a domain user/group i get this error:
> Error 15401: Windows NT user or group 'MYDOMAIN\Domain Users' not found.
> Check the name again.
>
>|||thank you, i found my problem tho, i needed to apply ISA 2004 standard
server's service pack 1. isa doesn't like win2003's sp1... isa's firewall
was stoping rpc.
"Hari Prasad" <hari_prasad_k@.hotmail.com> wrote in message
news:OTxmREUmFHA.2852@.TK2MSFTNGP15.phx.gbl...
> Hi,
> See the reply from Bill from a old postregarding the same issue.
> Hi Biva,
>
> I see this is a complex problem as usually the suggestions should work.
>
> The Enterprise Manager will use sp_grantlogin to grant permissions. When
> we
> use sp_grantlogin to grant the permissions to a NT User, the stored
> procedure calls
> LookupAccountSid function and that function looks in the SID cache on the
> local
> computer before it goes to a domain controller. If the SID in the cache is
> incorrect, then the problem would occur. This problem may occur if we
> rename the User account. As far as I know, the only method is to reboot
> the
> computer. However, you may check with Windows 2000 newsgroups for
> suggestions, e.g. microsoft.public.win2000.gener­al,
> microsoft.public.win2000.activ­e_directory.
>
> In addition, this indicates that domain names are not resolved properly.
> Please check in Administators Group in Computer Management. If domains
> accounts that are members 'ARE NOT' showing up like this,
> domain\account
>
> Instead, they show up as a long string of numbers, then it indicates that
> it is not resolved properly. Please check with Windows 2000 newsgroups to
> see if they have any suggestions.
>
> This posting is provided "AS IS" with no warranties, and confers no
> rights.
>
> Regards,
>
> Bill Cheng
> Microsoft Support Engineer
>
> Thanks
> Hari
> "James" <See.My.Sig@.The.Bottom.com> wrote in message
> news:s1wIe.13389$Bx5.11303@.trnddc09...
>> how come when i try to add a domain user/group i get this error:
>> Error 15401: Windows NT user or group 'MYDOMAIN\Domain Users' not found.
>> Check the name again.
>>
>>
>