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Windows IT Pro Blog
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Hardening administrative actions: What IT pros need to know

DashmeetAjmani's avatar
DashmeetAjmani
Icon for Microsoft rankMicrosoft
Apr 09, 2026
Administrative actions are undergoing hardening changes that reduce the risk of privilege escalation and unauthorized access on Windows devices. These changes strengthen the trust boundary between id...
Screenshot of a User Account Control dialog box asking permission for the Terminal app to make changes to the device.
Updated Apr 09, 2026
Version 2.0
deployment
security
servicing and updates
windows 11
MIJ2021's avatar
MIJ2021
Brass Contributor
Apr 14, 2026

DashmeetAjmani​   

If two Server (domain member Server) 2025 systems (with all Windows updates installed) have the same local SID, certain functions – such as RDP or Admin$ – dont work. In a Server 2025 domain environment, will a ‘clean’ server then also have its access blocked by the domain controller to a server with a duplicate SID after the Windows April 2026 update are installed?  TIA br Johannes

  • SusanBinfo's avatar
    SusanBinfo
    Copper Contributor
    Apr 14, 2026

    MIJ2021​  This change is already in the updates released since August of last year.  So if you have dup sids you probably already are seeing side effects.