every time i update to a newer version of Windows 25H2 i loss connection to my other computers on the network. I have to uninstall the update and run 24H2. This has been going on since October 2025. HELP Ivan B • 122.3K Reputation points • Independent Advisor 2026-09-08T21:05:00.8366667+00:00 Hi, What network error are you seeing—is it related to the IP connection type or an authentication failure? If possible, please let me know the specific error message that appears when you try to access SMB. Thanks. 5 comments Show comments for this answer Ivan B • 122.3K Reputation points • Independent Advisor 2026-09-10T00:03:00.6+00:00 Hi, If possible, please run a test: create a local account on the computers in question, grant the necessary permissions, and try connecting. I believe you are likely using the same Microsoft account for Windows on both computers. If that fails, run the following commands in Windows PowerShell (as administrator): Set-SmbClientConfiguration -RequireSecuritySignature $false Set-ItemProperty -Path "HKLM:\SYSTEM\CurrentControlSet\Services\LanmanWorkstation\Parameters" RequireSecureNegotiate -Value 0 -Force Restart the computer and try again. Please let me know the result. Thanks. 2 votes MarkMac51 • 0 Reputation points 2026-09-10T15:34:59.1666667+00:00 do i run Set-ItemProperty -Path "HKLM:\SYSTEM\CurrentControlSet\Services\LanmanWorkstation\Parameters" RequireSecureNegotiate -Value 0 -Force with Windows Power Shell (as Admin) also? 0 votes Ivan B • 122.3K Reputation points • Independent Advisor 2026-09-10T20:39:40.5466667+00:00 Hi, That's correct. Thanks. 0 votes MarkMac51 • 0 Reputation points 2026-09-10T20:57:40.0666667+00:00 I g i got this error message 0 votes Ivan B • 122.3K Reputation points • Independent Advisor 2026-09-10T20:59:47.8166667+00:00 Hi, Did you run the command on both computers—the one you are trying to access and the one that is sharing? Thanks. 0 votes Sign in to comment Add comment What network error are you seeing—is it related to the IP connection type or an authentication failure? If possible, please let me know the specific error message that appears when you try to access SMB. Ivan B • 122.3K Reputation points • Independent Advisor 2026-09-10T00:03:00.6+00:00 Hi, If possible, please run a test: create a local account on the computers in question, grant the necessary permissions, and try connecting. I believe you are likely using the same Microsoft account for Windows on both computers. If that fails, run the following commands in Windows PowerShell (as administrator): Set-SmbClientConfiguration -RequireSecuritySignature $false Set-ItemProperty -Path "HKLM:\SYSTEM\CurrentControlSet\Services\LanmanWorkstation\Parameters" RequireSecureNegotiate -Value 0 -Force Restart the computer and try again. Please let me know the result. Thanks. 2 votes If possible, please run a test: create a local account on the computers in question, grant the necessary permissions, and try connecting. I believe you are likely using the same Microsoft account for Windows on both computers. If that fails, run the following commands in Windows PowerShell (as administrator): Set-SmbClientConfiguration -RequireSecuritySignature $false Set-ItemProperty -Path "HKLM:\SYSTEM\CurrentControlSet\Services\LanmanWorkstation\Parameters" RequireSecureNegotiate -Value 0 -Force Restart the computer and try again. Please let me know the result. MarkMac51 • 0 Reputation points 2026-09-10T15:34:59.1666667+00:00 do i run Set-ItemProperty -Path "HKLM:\SYSTEM\CurrentControlSet\Services\LanmanWorkstation\Parameters" RequireSecureNegotiate -Value 0 -Force with Windows Power Shell (as Admin) also? 0 votes do i run Set-ItemProperty -Path "HKLM:\SYSTEM\CurrentControlSet\Services\LanmanWorkstation\Parameters" RequireSecureNegotiate -Value 0 -Force with Windows Power Shell (as Admin) also? Ivan B • 122.3K Reputation points • Independent Advisor 2026-09-10T20:39:40.5466667+00:00 Hi, That's correct. Thanks. 0 votes That's correct. MarkMac51 • 0 Reputation points 2026-09-10T20:57:40.0666667+00:00 I g i got this error message 0 votes i got this error message Ivan B • 122.3K Reputation points • Independent Advisor 2026-09-10T20:59:47.8166667+00:00 Hi, Did you run the command on both computers—the one you are trying to access and the one that is sharing? Thanks. 0 votes Did you run the command on both computers—the one you are trying to access and the one that is sharing? MarkMac51 • 0 Reputation points 2026-09-09T17:22:28.4066667+00:00 Here are the SID number of the two computers 0 comments No comments Sign in to comment Add comment Here are the SID number of the two computers MarkMac51 • 0 Reputation points 2026-09-08T21:19:19.16+00:00 Some Windows 11 24H2/25H2 systems have duplicate machine SIDs , which also causes SMB sharing failures — even after uninstalling updates. This was confirmed by multiple users on Microsoft Q&A, where two identical machines could not share files due to identical SIDs after upgrading to 24H2 7 comments Show comments for this answer Ivan B • 122.3K Reputation points • Independent Advisor 2026-09-09T00:02:08.9733333+00:00 Hi, What about the SID if I'm using the same Microsoft account to access these SMB folders—whether between shared computers or on a NAS? Thanks. 0 votes MotoX80 • 37,861 Reputation points 2026-09-09T01:49:01.86+00:00 What about the SID if I'm using the same Microsoft account to access these SMB folders It has nothing to do with the users' SID. It's the SID of the computer account. This would only impact you if you were using virtual machines that you cloned from a base install, or used some disk copying tool to clone an existing pc and used that to build the other pc's OS. You can use the psgetsid tool from Microsoft's Sysinternals toolkit to display the SID. 0 votes MarkMac51 • 0 Reputation points 2026-09-09T17:10:28.66+00:00 0 votes MotoX80 • 37,861 Reputation points 2026-09-09T18:03:37.1633333+00:00 That's the sid for your meltg user account. The sid for the acctsreceivable pc is the same just without the -1002 at the end. If you have duplicate computer sid's you can install the known issue rollback. See the download.microsoft.com link from user GTS-NJ. https://learn.microsoft.com/en-us/answers/questions/5648842/latest-win-11-updates-have-enforced-sid-and-now-i 0 votes MotoX80 • 37,861 Reputation points 2026-09-09T19:58:49.1033333+00:00 I have this command in my notes. Run that and reboot on one pc and see if that works. reg add HKLM\SYSTEM\CurrentControlSet\Policies\Microsoft\FeatureManagement\Overrides /v 1517186191 /r REG_DWORD /v 0 /f 0 votes MarkMac51 • 0 Reputation points 2026-09-10T13:56:24.6166667+00:00 i got this error code 0 votes MarkMac51 • 0 Reputation points 2026-09-10T20:55:09.78+00:00 i get this error 0 votes Show 2 more comments Sign in to comment Add comment

Some Windows 11 24H2/25H2 systems have duplicate machine SIDs , which also causes SMB sharing failures — even after uninstalling updates. This was confirmed by multiple users on Microsoft Q&A, where two identical machines could not share files due to identical SIDs after upgrading to 24H2 Ivan B • 122.3K Reputation points • Independent Advisor 2026-09-09T00:02:08.9733333+00:00 Hi, What about the SID if I'm using the same Microsoft account to access these SMB folders—whether between shared computers or on a NAS? Thanks. 0 votes What about the SID if I'm using the same Microsoft account to access these SMB folders—whether between shared computers or on a NAS? MotoX80 • 37,861 Reputation points 2026-09-09T01:49:01.86+00:00 What about the SID if I'm using the same Microsoft account to access these SMB folders It has nothing to do with the users' SID. It's the SID of the computer account. This would only impact you if you were using virtual machines that you cloned from a base install, or used some disk copying tool to clone an existing pc and used that to build the other pc's OS. You can use the psgetsid tool from Microsoft's Sysinternals toolkit to display the SID. 0 votes What about the SID if I'm using the same Microsoft account to access these SMB folders It has nothing to do with the users' SID. It's the SID of the computer account. This would only impact you if you were using virtual machines that you cloned from a base install, or used some disk copying tool to clone an existing pc and used that to build the other pc's OS. You can use the psgetsid tool from Microsoft's Sysinternals toolkit to display the SID. MarkMac51 • 0 Reputation points 2026-09-09T17:10:28.66+00:00 0 votes MotoX80 • 37,861 Reputation points 2026-09-09T18:03:37.1633333+00:00 That's the sid for your meltg user account. The sid for the acctsreceivable pc is the same just without the -1002 at the end. If you have duplicate computer sid's you can install the known issue rollback. See the download.microsoft.com link from user GTS-NJ. https://learn.microsoft.com/en-us/answers/questions/5648842/latest-win-11-updates-have-enforced-sid-and-now-i 0 votes That's the sid for your meltg user account. The sid for the acctsreceivable pc is the same just without the -1002 at the end. If you have duplicate computer sid's you can install the known issue rollback. See the download.microsoft.com link from user GTS-NJ. https://learn.microsoft.com/en-us/answers/questions/5648842/latest-win-11-updates-have-enforced-sid-and-now-i MotoX80 • 37,861 Reputation points 2026-09-09T19:58:49.1033333+00:00 I have this command in my notes. Run that and reboot on one pc and see if that works. reg add HKLM\SYSTEM\CurrentControlSet\Policies\Microsoft\FeatureManagement\Overrides /v 1517186191 /r REG_DWORD /v 0 /f 0 votes I have this command in my notes. Run that and reboot on one pc and see if that works. MarkMac51 • 0 Reputation points 2026-09-10T13:56:24.6166667+00:00 i got this error code 0 votes i got this error code MarkMac51 • 0 Reputation points 2026-09-10T20:55:09.78+00:00 i get this error 0 votes i get this error MarkMac51 • 0 Reputation points 2026-09-08T21:15:08.0433333+00:00 It's not an error message it will not let me connection the network 0 comments No comments Sign in to comment Add comment It's not an error message it will not let me connection the network MarkMac51 • 0 Reputation points 2026-09-08T21:11:34.5166667+00:00 When i try to link to the network i put in the correct User and Password and it will not let me log in. Only after i uninstall the update it all works again 0 comments No comments Sign in to comment Add comment When i try to link to the network i put in the correct User and Password and it will not let me log in. Only after i uninstall the update it all works again