🟡 Medium   ⏱ 5–30 min  Last verified: 19 May 2026
Affected versions: Windows Server 2012 R2

📖 ~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

DHCP failover lease sync intermittently lags.

Environment & Reproduction

Appears after NIC advanced-property changes.

Get-DhcpServerv4Failover
Get-NetAdapterAdvancedProperty -Name 'Ethernet'

Root Cause Analysis

Offload changes affect failover replication packet handling.

Quick Triage

Validate partner state and adapter drift.

Step-by-Step Diagnosis

Correlate failover events with NIC error counters.

Illustrative mockup for windows-server-2012-r2 — terminal_or_powershell
DHCP failover diagnostics — Illustrative mockup — Progressive Robot

Solution — Primary Fix

Revert unstable properties and update driver.

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Set-NetAdapterAdvancedProperty -Name 'Ethernet' -DisplayName 'Large Send Offload v2 (IPv4)' -DisplayValue 'Disabled'
Illustrative mockup for windows-server-2012-r2 — event_or_log_viewer
Failover replication healthy — Illustrative mockup — Progressive Robot

Solution — Alternative Approaches

Increase MCLT temporarily while rollout completes.

Verification & Acceptance Criteria

Failover remains Normal with timely lease replication.

Rollback Plan

Restore previous adapter profile and failover settings.

Prevention & Hardening

Freeze NIC baselines on DHCP infrastructure.

Related to NDIS drops and DPC latency spikes.

Related tutorial: View the step-by-step tutorial for Windows Server 2012 R2.

View all Windows Server 2012 R2 tutorials on the Tutorials Hub →

Browse all common problems & solutions on the Tutorials Hub.

References & Further Reading

DHCP failover networking guidance.

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