0XC00000D2

STATUS_NET_WRITE_FAULT 0xC00000D2: Fix the Network Write Error

EP
Erropedia Team
📅 May 27, 2026 📅 Updated Sep 14, 2026 👁 33 views Network & Connectivity Intermediate
STATUS_NET_WRITE_FAULT means Windows failed to write data over the network—usually from a dead NIC driver, a loose cable, or a flaky switch port. The fix is almost always driver or cable related.

Quick Answer

Update your NIC driver to the latest manufacturer version (not Microsoft's generic one), replace the Ethernet cable with a known-good Cat5e+, and reboot the switch port.

What's Going On?

This error pops up when Windows can't complete a network write operation—usually during file transfers over SMB, backup jobs, or database writes. I've seen it most often on Windows 10 21H2 through Windows 11 23H2, especially on Realtek and Intel 2.5GbE NICs. The culprit here is almost always a bad driver, a physically damaged cable, or a switch port that's gone flaky. Don't bother with Winsock resets or registry tweaks—they rarely fix this.

Fix Steps

  1. Update the NIC driver. Go to Device Manager > Network adapters > right-click your NIC > Update driver > Browse my computer > Let me pick > uncheck Show compatible hardware > choose the latest manufacturer driver. For Intel, get the PROSet package. For Realtek, grab the latest from Realtek's site—not Windows Update.
  2. Replace the Ethernet cable. Use a Cat5e or Cat6 cable you know works. I've seen intermittent write faults disappear with nothing but a cable swap. Check for bent pins on the RJ45 connector.
  3. Reboot the switch or router port. Unplug the cable, wait 10 seconds, plug it back in. If the port is managed, clear the port counters or disable/enable it.
  4. Disable power saving on the NIC. In Device Manager, open the NIC properties > Power Management tab > uncheck 'Allow the computer to turn off this device to save power'. Also go to Advanced tab > disable 'Energy-Efficient Ethernet' and 'Green Ethernet'.
  5. Test with a direct connection. Plug the affected machine directly into the router or a known-good switch port. If the fault stops, the original port might be dying.

Alternative Fixes

If the main steps don't work, try these:

  • Disable IPv6. Only if you don't need it. Open Network Connections > right-click your adapter > Properties > uncheck Internet Protocol Version 6 (TCP/IPv6).
  • Run SMB direct. If you're copying to a Windows server, enable SMB over RDMA (if supported) or use the robocopy /J flag for unbuffered I/O.
  • Check Event Viewer. Look under System for Event ID 12345 or NDIS warnings. That'll tell you which driver or hardware entry triggered the fault.

Prevention Tip

Keep NIC drivers locked to a stable manufacturer version—never let Windows Update touch them. Use a managed switch with link monitoring so you can spot CRC errors before they become write faults. And for the love of god, don't run critical network traffic over cheap 5-meter cables that came with a printer.

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EP
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Tech Support Editors
The Erropedia editorial team researches and documents real-world tech errors from across Windows, Linux, macOS, networking, databases, cloud platforms, and more. Every solution is reviewed for accuracy and updated as software and systems evolve.