Microsoft has issued a warning to IT administrators regarding a potential issue with Windows Server 2025 domain controllers. Following a restart, these controllers may lose network connectivity due to improper management of network traffic. The problem affects servers hosting the Active Directory domain controller role, which may become inaccessible on the domain network or even allow unauthorized access over ports that should be blocked.
As per a release on Microsoft’s update dashboard, if domain controllers reboot, they might revert from the domain firewall profile to the standard firewall profile. Consequently, applications or services running on the domain controller or on remote devices could fail or remain unreachable.
Currently, Microsoft has not released a patch for this connectivity issue but is working on a fix for an upcoming release. In the meantime, there is a workaround that administrators can follow: they need to restart the network adapter whenever the server is rebooted. This can be accomplished manually or by executing the PowerShell command Restart-NetAdapter *. Microsoft further recommends automating this task by creating a scheduled task to ensure the network adapter restarts each time the server is rebooted.