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A SID is a variable-length numeric value that consists of a structure revision number, a 48-bit identifier authority value, and a variable number of 32-bit subauthority or relative identifier (RID) values.The authority value identifies the agent that issued the SID, and this agent is typically a Windows local system or a domain.However, some IT administrators install Windows on one of their systems, install and configure applications, then use deployment tools that don’t reset the SIDs of the copies of the Windows installations.
A machine SID is a unique identifier generated by Windows Setup that Windows uses as the basis for the SIDs for administrator-defined local accounts and groups.
The more I thought about it, the more I became convinced that machine SID duplication – having multiple computers with the same machine SID – doesn’t pose any problem, security or otherwise.
I took my conclusion to the Windows security and deployment teams and no one could come up with a scenario where two systems with the same machine SID, whether in a Workgroup or a Domain, would cause an issue.
After a user logs on to a system, they are represented by their account and group SIDs with respect to object authorization (permissions checks).
If two machines have the same machine SID, then accounts or groups on those systems might have the same SID.
If the computer is part of a Workgroup, then the credentials you specify must be for a local account on the remote system; for a Domain-joined system, the credentials can be for a remote system’s local account or a Domain account.