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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. ... Proxy-Support: Session-Based-Authentication. ... The HTTP status and sub status is 401.1, ...
https://social.technet.microsoft.com/Forums/en-US/42aae94e-64c6-4ca7-8274-a2921316321f/adfs-2016-sso-error-http11-401-unauthorized
Nov 22, 2018 · HTTP/1.1 401 Unauthorized Content-Length: 0 Server: Microsoft-HTTPAPI/2.0 WWW-Authenticate: Negotiate WWW-Authenticate: NTLM Date: Wed, 21 Nov 2018 00:32:22 GMT Proxy-Support: Session-Based-Authentication. It then prompts me to login, and if I log in, everything works OK. So fundamentally ADFS is working, but SSO isnt.
https://stackoverflow.com/questions/6189547/request-to-web-service-with-basic-authorization-via-proxy-with-ntlm-authorizatio
I have a web service that requires basic authorisation and a user behind an internet proxy that requires NTLM authorisation. I also have a forms application that makes calls to the web service and also asks the user for the web service credentials (which are different from the NTLM credentials).
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://tools.ietf.org/html/rfc7235
RFC 7235 HTTP/1.1 Authentication June 2014 4.2.Authorization The "Authorization" header field allows a user agent to authenticate itself with an origin server -- usually, but not necessarily, after receiving a 401 (Unauthorized) response. Its value consists of credentials containing the authentication information of the user agent for the realm of the resource being requested.
https://serverfault.com/questions/341978/troubleshooting-windows-authentication-problems-no-challenge-in-iis-7-5
Problem solved. I finally decided to compare the module list side-by-side and there actually was one missing. It turns out that there are two Windows Authentication modules:. On the server, the managed WindowsAuthentication module was there, but not the native WindowsAuthenticationModule highlighted above. Why it was configured that way is anyone's guess, but apparently if the native module is ...
https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/401
This status is similar to 403, but in this case, authentication is possible. Status 401 Unauthorized Example response HTTP/1.1 401 Unauthorized Date: Wed, 21 Oct 2015 07:28:00 GMT WWW-Authenticate: Basic realm="Access to staging site" Specifications
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