Error Code Portal
MicrosoftWindows Win32Error code

9505

DNS_ERROR_UNSECURE_PACKET

Alternative forms: 0x00002521 · 0x2521 · DNS_ERROR_UNSECURE_PACKET · 0x80072521

What does this code mean?

Code 9505 · An issue reported by Windows Win32.

Official explanation · Original text

Unsecured DNS packet.

Troubleshooting and diagnostic links

First check that the document's product, version, and environment match your situation.

Source and terms of use

System Error Codes (9000-11999) (WinError.h) ↗

Creator: Microsoft and MicrosoftDocs contributors
License: Creative Commons Attribution 4.0 International
Checked on: 2026-11-12

Modifications: Extracted numeric codes, symbolic names and English message text; converted Markdown/HTML to plain text and normalized whitespace; added Korean product context, namespace labels, status classification and separately labeled official links. No machine translation of message text.

Source details · Original licenses and notices