Windows Server / Active Directory & Group Policy
Read the exact replication error for a domain controller
A replication summary can hide that only one naming context or partner is affected. Collect partner-specific status before assigning a network or authentication cause.
Environment and inputs: Windows Server 2022 / 2025 baseline · Windows PowerShell with the specified role or RSAT modules; native utilities are identified in the text. Use delegated administration and elevation only where required.
Start with this check
Confirm the host, shell and access role. Replace sample names, paths, domains and interfaces with approved targets. These are diagnostic commands; assess policy and workload impact before making changes.
repadmin /showrepl DC01Read the result
Replace DC01 with the intended controller. Last attempt, last success and naming-context details help separate a recent transient failure from a persistent outage.
Resolve and verify
Look up the actual error and compare relevant DNS, time, RPC and AD service evidence on both controllers. Verify that the same context replicates successfully after correction.
Before changing production
Output exposes internal topology. Avoid broad forced replication while the underlying error remains unresolved.