Applications Systems

Error 407: Proxy authentication required

This article provides brief information and steps to resolve the following error: 407: Proxy authentication Required.

First published date

11/29/2018 10:29 PM

Last published date

11/29/2018 10:29 PM

Overview

This article provides brief information and steps to resolve the following error:

407: Proxy authentication Required

During a NT LAN Manager (NTLM) authentication, McAfee Web Gateway sends a response with the wrong flag. This causes an unhanded exception inside the .NET 3.5 WebClient class. This incorrect flag breaks the NTLM authentication process before it has completed, throwing the exception.

Product section

Server Application Monitor

Cause

This is a known issue with McAfee Web Gateway, version 6.x. McAfee claims to have fixed this issue in version 7.x.

Resolution

An option is added in McAfee version 7.x which addresses this special issue.

Under Policy > Settings > Engines > Authentication, select your settings container which uses NTLM. An option to Send domain and machine name to the client. Check this option and try again.

Formerly KB - Remote server returns error: (407) Proxy Authentication Required for more information.

McAfee's blog concerning this issue can be found here.

Disclaimer: Please note, any content posted herein is provided as a suggestion or recommendation to you for your internal use. This is not part of the SolarWinds software or documentation that you purchased from SolarWinds, and the information set forth herein may come from third parties. Your organization should internally review and assess to what extent, if any, such custom scripts or recommendations will be incorporated into your environment. You elect to use third party content at your own risk, and you will be solely responsible for the incorporation of the same, if any.

Disclaimer: Please note, any content posted herein is provided as a suggestion or recommendation to you for your internal use. This is not part of the SolarWinds software or documentation that you purchased from SolarWinds, and the information set forth herein may come from third parties. Your organization should internally review and assess to what extent, if any, such custom scripts or recommendations will be incorporated into your environment. You elect to use third-party content at your own risk, and you will be solely responsible for the incorporation of the same if any.