DNS_ERROR_UNSECURE_PACKET 0x80072521

Error code 9505 · HRESULT 0x80072521

WINDOWS

Unsecured DNS packet.

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_UNSECURE_PACKET is a Windows error code (system error 9505, returned as HRESULT 0x80072521) reported by Windows. Its official message is: “Unsecured DNS packet.”

How to fix DNS_ERROR_UNSECURE_PACKET

  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_RCODEDNS_ERROR_NO_PACKETDNS_ERROR_BAD_PACKETDNS_ERROR_INVALID_TYPEDNS_REQUEST_PENDINGDNS_INFO_NO_RECORDSDNS_ERROR_INVALID_IP_ADDRESS

Source: Microsoft WinError.h

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