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0x00000126BSODCritical

0x00000126 — NETIO Invalid Pool Caller | Blue Screen Fix Guide

NETIO_INVALID_POOL_CALLER

Windows XPWindows VistaWindows 7Windows 8Windows 10Windows 11

What Does 0x00000126 Mean?

A network I/O subsystem (NetIO) detected an invalid pool caller.

Real-World Causes

  1. 1Network driver making invalid memory allocations
  2. 2NetIO subsystem corruption
  3. 3Network stack driver bug

Symptoms

  • ⚠Blue screen with stop code NETIO_INVALID_POOL_CALLER
  • ⚠System reboots unexpectedly
  • ⚠Possible data loss from unsaved work

DIY Fix

Beginner-friendly steps you can try at home

  1. 1Restart your computer
  2. 2Update network drivers
  3. 3Reset network settings
  4. 4Run network troubleshooter

Advanced Fix

For experienced users and IT professionals

  1. 1Analyze minidump for faulting network driver
  2. 2Use netsh to reset TCP/IP stack
  3. 3Check for firmware updates on network hardware
  4. 4Capture network trace for analysis

Frequently Asked Questions

What causes NETIO_INVALID_POOL_CALLER?
A network I/O subsystem (NetIO) detected an invalid pool caller.
Can I fix NETIO Invalid Pool Caller myself?
In many cases yes. Start with basic troubleshooting like restarting, updating drivers, and running System File Checker. If the issue persists, advanced analysis of crash dumps may be needed.

Related Error Codes

0x000000C2Bad Pool Caller0x00000125NMR Invalid State

About the Author

Windows Troubleshooting Team

Verified against official Microsoft documentation and real-world diagnostic data. Error behavior confirmed across Windows 10, Windows 11, and Windows Server.