65.051 Changing the SID of a Windows device

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Document Name	65.050051 StoppingChanging Edgethe openingSID PDFof documentsa Windows device
Version	v1.0 Current
Author	Neil Tancock, IT Services (Safeharbour Support Ltd), neil@safeharboursupport.com
Approval	Safeharbour Support
Approval date	19-22-SEP-2025	Review date	19-SEP-2027
AbsractAbstract	None
Scope	This document applies to all clients of Safeharbour Support Ltd
Inputs	None
Outputs	None

 

Change Control 

Date	Author	Version	Change
19-22-SEP-2025	Neil Tancock	0.0	First version
19-22-SEP-2025	Neil Tancock	1.0	Approved

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Microsoft have said that a SID is not important.   However it can cause issues with File&Print services as SMB clients use the SID to identify each other. 

When KB5065426 was released in September 2025, any Windows device that had the same SID as another - if they had, for example, been cloned - would refuse to connect, citing a bad Username & Password.  The target system immediately shows LSA(LsaSrv) Event ID 6167 "There is a partial mismatch in the machine ID. This indicates that the ticket has either been manipulated or it belongs to a different boot session. Failing authentication."

To find the current SID of a system;

Download and unzip PS Tools Run command prompty as administrator cd to the directory you expanded PS Tools into psgetsid64[ENTER]

This will display the current SID of the system.  Make a not of it. 

To change the SID of a system

Go to https://www.stratesave.com/html/downloads.html and download SIDCHG 64 bit Go to https://www.stratesave.com/html/sidchg.html and scroll down to the trial key.  Make a note of it.  you will need to write it down manually.

Switch off the responsive firewall

Start -> Settings Privacy & Security Windows Security Virus & Threat Protection In Virus & threat protection settings, click Manage settings Disable Real-time protection Run command prompt on the system as Administrator cd to the folder you downloaded the sidchg exe into Run the SID changer;

sidchg64-3.0m.exe /R It will ask for the licence key, enter the one you noted It MAY say that a service needs to be stop and to restart.  If so, do so and then run these commands again, including disabling Real-time protection Say y to the prompt, the SID will be changed, you will be logged out the machine will restart.  DO not restart it manually or log in until the machine has restarted itself Once the machine has restarted and is showing the login prompt without the black SID IS CHANGING screen, it is safe to log in.  Run PS Tools again to confirm the SID has changed,

 

 

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