данную проблему приняли как баг:
> I have tested and reproduced the problem. As you have found already,
it
> is if the Windows Group name is longer than 31 characters. This
31
> character limit includes the 'domain\' or 'localmachine\', so
the
> actual group name will have to be less than 31 depending on how
large
> the domain name/ machine name is.
>
> I have logged
this as a bug, as you should be able to grant privileges
> to a group as
long as that group can be added to SQL Server:
>
> [#NIM068853
Cannot grant privileges to a Windows Group that is greater
> than 31
characters using the Change Privileges ArcToolbox tool. ]
>
> This
will be reviewed by Development shortly. Thanks for bringing this
> to our
attention and if there is anything else I can do, please just
> let me
know.