The issue you are experiencing with users being unable to log in to their Windows 11 PCs after waking from sleep mode could be related to several factors, especially considering that the problem occurs in an Active Directory (AD) environment. Here are some troubleshooting steps and considerations:
- Network Connectivity: Since changing networks (Ethernet to Wi-Fi and vice versa) sometimes resolves the issue, it suggests there may be a network-related problem. Ensure that the network connection is stable and that there are no intermittent connectivity issues when waking from sleep.
- Secure Channel Issues: Although you mentioned that the SecureChannel is OK, it might be worth rechecking the secure channel status. You can run the command
nltest /sc_verify:<DomainName>to confirm that the secure channel is functioning correctly. - Time Synchronization: You confirmed that the PC time is correct, which is crucial for Kerberos authentication. Ensure that all domain controllers are synchronized with the same time source.
- Group Policy Settings: Review any Group Policy settings that might affect logon behavior after sleep. There may be policies that impact how credentials are cached or how the system interacts with the domain during wake events.
- Event Logs: While you mentioned there are no logs or events on the DCs, check the local event logs on the affected PCs for any warnings or errors related to authentication or network connectivity around the time the issue occurs.
- Power Management Settings: Since disabling Windows standby and network cards did not help, ensure that the power management settings for the network adapter are not set to allow the computer to turn off the device to save power.
- Testing with Different User Accounts: If possible, test with different user accounts to determine if the issue is user-specific or affects all users.
- Windows Updates: Ensure that all Windows updates are applied, as there may be fixes related to login issues in newer updates.
If the problem persists after these checks, consider reaching out to Microsoft support for further assistance, as they may have additional insights or updates regarding this specific issue with Windows 11 and Active Directory.
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