The MS-CHAP Version 1 Authentication Protocol Has Been Deprecated in Windows Vista

Overview

The MicroSoft Challenge Handshake Authentication Protocol version 1 (MS-CHAP v1) has been deprecated in Windows Vista. This paper discusses this change and provides methods to work around it. In Windows Vista, Microsoft has removed MS-CHAP v1 from the list of authentication protocols for dial-up connections, for broadband (PPPoE) connections, and for Virtual Private Network (VPN) connections. This change has been made because MS-CHAP version 2 (MS-CHAP v2) provides better security.