Windows Server 2012 R2 – iSCSI initiator driver sessions fail to reconnect – Fix and 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

iSCSI volumes disconnect and reconnect too slowly after link flaps.

Environment & Reproduction

Reproduced with brief uplink interruption.

Get-IscsiSession
Get-IscsiTargetPortal

Root Cause Analysis

Recovery timers and initiator path behavior are misaligned.

Quick Triage

Verify service state and portal reachability.

Step-by-Step Diagnosis

Review persistence settings and multipath policy.

Solution — Primary Fix

Tune reconnect settings and update storage drivers.

Set-Service MSiSCSI -StartupType Automatic
Restart-Service MSiSCSI

Solution — Alternative Approaches

Dedicate NICs for storage traffic.

Verification & Acceptance Criteria

Sessions recover within defined SLA after interruption.

Rollback Plan

Restore previous initiator and path policy export.

Prevention & Hardening

Monitor iSCSI events and validate dual-path health routinely.

Related Errors & Cross-Refs

Linked to MPIO lag and Storport timeout events.

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

iSCSI resiliency and tuning documentation.