📖 ~1 min read
Table of contents
Symptom & Impact
Live migration fails and VMs remain pinned to source hosts, reducing maintenance flexibility and increasing outage risk during host work.
Environment & Reproduction
Usually appears after host replacement, SPN drift, or delegation policy changes. Reproduce by removing required CIFS/Microsoft Virtual System Migration Service delegation.
Root Cause Analysis
Kerberos double-hop requirements are not met, migration networks are mis-scoped, or host trust/SPN records are inconsistent.
Quick Triage
Check Hyper-V event channels, test host-to-host name resolution, and validate constrained delegation settings for migration endpoints.
Step-by-Step Diagnosis
Verify SPNs, delegation targets, migration protocol selection, and dedicated migration NIC routing/MTU consistency.
Solution – Primary Fix
Correct constrained delegation for both hosts, ensure DNS/SPN correctness, and retry migration over validated migration networks.
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Solution – Alternative Approaches
Use CredSSP for short-term operational continuity during maintenance while Kerberos delegation is remediated.
Verification & Acceptance Criteria
Multiple test VMs migrate successfully with no downtime and no new auth-related Hyper-V errors.
Rollback Plan
Revert delegation or migration network changes if broad failures occur, then restore last known working host settings.
Prevention & Hardening
Automate host onboarding checks for SPN/delegation compliance and continuously test migration pathways.
Related Errors & Cross-Refs
Can overlap with cluster validation warnings, DNS registration issues, and SMB authentication failures.
Related tutorial: View the step-by-step tutorial for Windows Server 2022.
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References & Further Reading
Use Microsoft Hyper-V live migration and constrained delegation documentation as implementation baseline.
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