DNS_ERROR_DEFAULT_VIRTUALIZATION_INSTANCE 0x800726C5

Error code 9925 · HRESULT 0x800726C5

WINDOWS

The default virtualization instance cannot be added, removed or modified.

Windows troubleshooting diagram: Device Manager warning and a system file scan
Windows errors: check drivers, system files and Event Viewer, in that order.

What it means

DNS_ERROR_DEFAULT_VIRTUALIZATION_INSTANCE is a Windows error code (system error 9925, returned as HRESULT 0x800726C5) reported by Windows. Its official message is: “The default virtualization instance cannot be added, removed or modified.”

How to fix DNS_ERROR_DEFAULT_VIRTUALIZATION_INSTANCE

  1. Test connectivity to the remote host first (ping, then the exact port)
  2. Check firewall, VPN and proxy rules for the involved process
  3. Run 'ipconfig /flushdns' and 'netsh interface ip reset', then reboot

Related errors

DNS_ERROR_DEFAULT_ZONESCOPEDNS_ERROR_DEFAULT_SCOPEDNS_ERROR_INVAILD_VIRTUALIZATION_INSTANCE_NAMEDNS_ERROR_VIRTUALIZATION_TREE_LOCKEDDNS_ERROR_VIRTUALIZATION_INSTANCE_DOES_NOT_EXISTDNS_ERROR_VIRTUALIZATION_INSTANCE_ALREADY_EXISTSDNS_ERROR_RRL_LEAK_RATE_LESSTHAN_TC_RATE

Source: Microsoft WinError.h

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