Windows Server 2022 – DHCP failover relationship out of sync – Fix & Prevention

📖 ~1 min read

Table of contents

1. Symptom & Impact
2. Environment & Reproduction
3. Root Cause Analysis
4. Quick Triage
5. Step-by-Step Diagnosis
6. Solution – Primary Fix
7. Solution – Alternative Approaches
8. Verification & Acceptance Criteria
9. Rollback Plan
10. Prevention & Hardening
11. Related Errors & Cross-Refs
12. References & Further Reading

Symptom & Impact

Primary and partner DHCP nodes diverge, producing duplicate assignment risk or delayed lease updates.

Environment & Reproduction

Seen after network interruption, partner downtime, or failover state transitions.

Get-DhcpServerv4Failover
Get-DhcpServerv4ScopeStatistics
Get-Service DHCPServer

Root Cause Analysis

Communication breaks or inconsistent database state leaves failover relationship in interrupted modes.

Quick Triage

Identify relationship state and communication health.

Get-DhcpServerv4Failover | Select Name,State,Mode,PartnerServer
Test-NetConnection dhcp02.corp.local -Port 647
Get-WinEvent -LogName System -MaxEvents 20

Step-by-Step Diagnosis

Confirm partner availability and compare scope statistics.

Get-DhcpServerv4ScopeStatistics
Invoke-Command -ComputerName dhcp02 { Get-DhcpServerv4ScopeStatistics }
Get-DhcpServerv4FailoverStatistics

Solution – Primary Fix

Force failover resynchronization from healthy partner.

Invoke-DhcpServerv4FailoverReplication -ComputerName dhcp01 -Name CorpFailover
Restart-Service DHCPServer
Get-DhcpServerv4Failover

Solution – Alternative Approaches

Recreate relationship when replication metadata is unrecoverable.

Remove-DhcpServerv4Failover -Name CorpFailover -Force
Add-DhcpServerv4Failover -Name CorpFailover -PartnerServer dhcp02 -ScopeId 10.0.10.0 -AutoStateTransition $true

Verification & Acceptance Criteria

Relationship reports Normal and lease updates replicate in both directions.

Get-DhcpServerv4Failover
Get-DhcpServerv4FailoverStatistics
Get-DhcpServerv4Lease -ScopeId 10.0.10.0 | Select -First 5

Rollback Plan

Return to prior single-server scope handling if failover recreation impacts production leases.

Remove-DhcpServerv4Failover -Name CorpFailover -Force

Prevention & Hardening

Alert on failover state transitions and maintain partner capacity parity.

Get-DhcpServerv4Failover | Export-Csv dhcp-failover-state.csv -NoTypeInformation

Related Errors & Cross-Refs

Correlates with packet loss on failover port, clock skew, and scope overutilization.

Related tutorial: View the step-by-step tutorial for Windows Server 2022.

View all Windows Server 2022 tutorials on the Tutorials Hub →

Browse all common problems & solutions on the Tutorials Hub.

References & Further Reading

Microsoft Learn: DHCP failover architecture, replication, and operational troubleshooting.