Error Code Portal
MicrosoftWindows WinINetError code

12003

ERROR_INTERNET_EXTENDED_ERROR

Alternative forms: 0x00002EE3 · 0x2EE3 · ERROR_INTERNET_EXTENDED_ERROR

What does this code mean?

Code 12003 · An issue reported by Windows WinINet.

Official explanation · Original text

An extended error was returned from the server. This is typically a string or buffer containing a verbose error message. Call InternetGetLastResponseInfo to retrieve the error text.

Troubleshooting and diagnostic links

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

This entry links only to official code reference documentation. No separate troubleshooting procedure has been verified.

Source and terms of use

Error Messages (Wininet.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