Microsoft has identified a bug affecting Windows 11 and Server 2025 systems, specifically those cloned with duplicate Security Identifiers (SIDs). This issue impacts access to network shares, Remote Desktop, and file access.
Patch Details
On 2025-10-24, Microsoft released two updates: KB5064081 and KB5065426, aimed at addressing the SID duplication problems. These patches are available for Windows 11 and Server 2025 users.
Suggested Resolution
Microsoft advises that systems affected by the duplicate SID issue should undergo a complete rebuild. This is currently the only reliable solution to restore network functionality and access.
Expected Impacts
- Duplicate SIDs cause network access issues as of 2025-10-24
- Updates KB5064081, KB5065426 are available for Windows 11
- Rebuilding affected systems recommended for SID resolution
