If the SYSVOL is no longer replicating after maintenance on a domain controller, what action should be taken?

In situations where the SYSVOL folder is no longer replicating after maintenance on a domain controller, the most appropriate action is to rebuild the SYSVOL. This is necessary because SYSVOL contains critical domain-wide data such as Group Policy Objects and scripts necessary for the functionality of Active Directory, and if it fails to replicate, it can lead to inconsistencies across domain controllers.

Rebuilding SYSVOL ensures that the folder is restored to a healthy state and that the replication mechanism is reestablished. This may involve using tools or procedures specific to the environment, such as filesync commands or initiating the "ntfrs" (File Replication Service) or "DFSR" (Distributed File System Replication) processes, depending on which replication method is in use.

The other actions listed, such as resetting the domain controller, reinstalling Active Directory, or checking the system logs, do not directly resolve the specific issue of non-replicating SYSVOL. While checking system logs can help to diagnose the underlying issue, the immediate requirement is to ensure that SYSVOL is functioning correctly. Rebuilding SYSVOL directly addresses the replication problem, making it the most effective and targeted solution.