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https://support.microsoft.com/en-us/help/2749007/an-unexpected-401-1-status-is-returned-when-using-pre-authentication-h
Aug 22, 2012 · An unexpected 401.1 status is returned when using Pre-Authentication Headers with Internet Explorer and Internet Information Services. ... occur if the web browser's first request sent to the IIS application contains an NTLM or Negotiate WWW-Authorization header (known as Pre-Authentication). ... Proxy-Support: Session-Based-Authentication.
https://tools.ietf.org/html/rfc4559
If this is not honored, then the server can easily lose track of security context associations. A proxy that correctly honors client to server authentication integrity will supply the "Proxy-support: Session- Based-Authentication" HTTP header to the client in HTTP responses from the proxy.Cited by: 18
https://github.com/dotnet/corefx/issues/9234
Jun 07, 2016 · Since NTLM is session based, it requires the Proxy-Support: Session-Based-Authentication header to be included when authenticating through a proxy. Fiddler appears to add that header only if the first WWW-Authenticate header in the 401 response is either NTLM or Negotiate, or if a new connection is created and preauthenticated (The case when we ...
https://docs.microsoft.com/en-us/azure/active-directory/manage-apps/application-proxy-configure-single-sign-on-with-ping-access
Header-based authentication for single sign-on with Application Proxy and PingAccess. 10/24/2019; 9 minutes to read +8; In this article. Azure Active Directory (Azure AD) Application Proxy has partnered with PingAccess so that your Azure AD customers can access more of your applications.
https://stackoverflow.com/questions/6189547/request-to-web-service-with-basic-authorization-via-proxy-with-ntlm-authorizatio
I got the app configuration working (WCF ServiceModel), it's using the default proxy credentials, the request is authenticating with the proxy, but after it authenticates with the web service it does not send the request body for some reason. The process works if I test locally without the NTLM proxy.
https://sharepoint.stackexchange.com/questions/5467/why-do-i-get-a-401-error-when-calling-a-wcf-service-from-a-web-part
The HTTP request is unauthorized with client authentication scheme 'Negotiate'. The authentication header received from the server was 'NTLM'. I configured Fiddler on the web application running the web part and found that both Kerberos and NTLM authentication headers are being returned:
https://docs.telerik.com/fiddler/KnowledgeBase/SessionFlags
Prevent Fiddler from adding a "Proxy-Support: Session-Based-Authentication" header to HTTP/401 or HTTP/407 responses that request Negotiate or NTLM authentication. Requires Fiddler v2.1.4.2 or later. Performance Flags. x-TTFB. Deprecated. Use oSession.Timer instead. Time to the first byte of the response, in milliseconds. x-TTLB. Deprecated.
https://bugzilla.mozilla.org/show_bug.cgi?id=602814
But bug 592197 says NTLM auth through a proxy works. It was broken for SSL temporarily, but that works too. So what's different between this reporter's config/network and the people who reported, worked on, and tested bug 592197?Not "blocking" 1.9.2 security updates if it's been a problem since the initial 3.6 release, obviously the scenario in which this bug shows up is somewhat rare.
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