Windows Server 2019 – 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-backed volumes drop and do not reconnect quickly after network blips.

Environment & Reproduction

Reproduced by brief uplink interruption on initiator hosts.

Get-IscsiSession
Get-IscsiTargetPortal
Get-Service MSiSCSI

Root Cause Analysis

Session recovery timers and network path behavior are misaligned with storage target expectations.

Quick Triage

Check initiator service state and portal reachability before restarting services.

Test-NetConnection -ComputerName  -Port 3260
Get-WinEvent -LogName System -MaxEvents 100 | Where-Object {$_.Message -match 'iSCSI|disk'}

Step-by-Step Diagnosis

Review session persistence settings and multipath policy for each target.

Solution — Primary Fix

Tune iSCSI recovery parameters, update initiator-related drivers, and validate multipath policy.

Set-Service MSiSCSI -StartupType Automatic
Restart-Service MSiSCSI
iscsicli ListPersistentTargets

Solution — Alternative Approaches

Use dedicated iSCSI NICs and isolate storage traffic from general LAN workloads.

Verification & Acceptance Criteria

Sessions reconnect automatically within SLA after controlled network interruption.

Rollback Plan

Restore prior initiator configuration export and path policy settings.

Prevention & Hardening

Monitor iSCSI event stream and enforce dual-path validation after maintenance.

Related Errors & Cross-Refs

Tightly linked with MPIO failover lag and Storport timeout events.

Related tutorial: View the step-by-step tutorial for Windows Server 2019.

View all Windows Server 2019 tutorials on the Tutorials Hub →

Browse all common problems & solutions on the Tutorials Hub.

References & Further Reading

Microsoft iSCSI initiator and storage resiliency guidance.