STATUS_NDIS_BAD_VERSION 0xC0230004: Quick Fix

Cause 1: Outdated or Corrupt Network Adapter Driver

This is the culprit in about 80% of cases. The error pops up when you install a VPN client, update Windows, or connect a new network device. The network stack expects a newer NDIS version (like 6.40 on Windows 10 20H2+) but your driver's still talking NDIS 6.30. That mismatch triggers 0xC0230004.

Fix: Update or Reinstall Your Network Driver

1. Open Device Manager — press Win+X, select Device Manager.
2. Expand Network adapters — find your active NIC (usually a Realtek, Intel, or Qualcomm).
3. Right-click and select Update driver → Browse my computer → Let me pick from a list. Choose the latest version from the manufacturer.
4. If that doesn't work, right-click → Uninstall device (check Delete the driver software). Reboot — Windows will reinstall the generic driver.
5. For stubborn cases, grab the latest driver direct from the manufacturer's site (not Windows Update). Realtek's site has a PCIe GbE driver that fixes this exact issue on Dell Optiplex 3080s.

My fix: I've seen this on Lenovo ThinkPads with Intel I219-V NICs after a Windows 10 22H2 update. Rolling back to the OEM driver from Lenovo's catalog killed the error instantly.

Cause 2: Third-Party NDIS Drivers (VPN, Virtualization, Antivirus)

Apps that hook into the NDIS layer — like VPN clients (Cisco AnyConnect, OpenVPN), virtualization software (VirtualBox, VMWare), or antivirus with network filters — install their own NDIS miniport drivers. When those drivers are compiled for an older NDIS version, you get the error.

Fix: Disable or Update the Problematic Driver

1. Open Network Connections — ncpa.cpl from Run (Win+R).
2. Check for virtual adapters — look for names like VirtualBox Host-Only, Cisco AnyConnect, NordVPN TAP.
3. Right-click and disable each one. Then test if the error goes away.
4. If it does, update that software to the latest version. Example: VirtualBox 6.1.x had known NDIS version conflicts with Windows 10 21H2 — VirtualBox 7.0 fixed it.
5. Can't update? Uninstall the feature that adds the NDIS driver. In VirtualBox, go to File → Preferences → Network → remove the host-only network.

Common trigger: You install Cisco AnyConnect, reboot, and get the error on every network operation. That's the AnyConnect Network Access Manager (NAM) driver being too old. Uninstall NAM component, keep the core VPN client.

Cause 3: WFP (Windows Filtering Platform) Callout Driver Conflict

Less common but nasty. Third-party firewalls (Comodo, ZoneAlarm) or advanced security suites register WFP callout drivers that can conflict with the NDIS version check. The error usually appears after a Windows feature update when the WFP driver's version doesn't match.

Fix: Clean the WFP Driver Registry

1. Open regedit as admin.
2. Navigate to HKLM\SYSTEM\CurrentControlSet\Services\ and look for keys related to your firewall (e.g., cmdguard for Comodo, vsdatant for ZoneAlarm).
3. Back up the key (right-click → Export), then delete it.
4. Reboot — the error should vanish. Then reinstall the firewall software fresh.

If you're not sure which service is the culprit, run fltmc instances in an admin command prompt to list active filter drivers. Look for any with altitude values in the 180000-189999 range (those are WFP callout drivers).

Quick-Reference Summary

That's it. Start with the network driver — it's the fastest fix. Move to virtual adapters if the first one doesn't stick. The WFP path is your last resort.