With the NewSID tool no longer supported by Microsoft for more recent versions of Windows, you may find yourself in a situation where you need to generate a new SID on a Windows Server 2008 or Windows 7 computer, and wonder which tool you need to use. I myself have run across an issue in the past in our development environment where duplicate SIDs caused a problem. Care needs to be taken when cloning Windows virtual machines, particularly if they will later be used as domain controllers.
In order to avoid any issues like this, the new preferred method to set a new SID on a Windows machine is to use Sysprep. Before running Sysprep, you may wish to verify the current SID on the sytem that you wish to modify. This can easily be done by running the psgetsid utility, which is part of the excellent Pstools developed by Mark Russinovich. The output of the psgetsid command can be seen below, showing the current machine SID:
Next you can sysprep by running the following command:
The Sysprep process will take a few minutes to run, and will automatically reboot the system if you chose to do so. On reboot, the following screen will be displayed. Click 'Next' to continue:
After the sysprep process is complete, you can run psgetsid again to verify that a new SID has been generated for this computer: