Error 401 Ntlm
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401 response for each request using NTLM up vote 24 down vote favorite 17 We have here an asp.net 3.5 application using NTLM based windows authentication. The system runs on a private network that actually distributed over different geographic places (connected via VPN). We are now trying to optimize the website's performance. Because the way NTLM works, every new request to the IIS
Ntlm Http
is composed with 3 different requests while the first 2 is 401 responses. We are trying to minimize the amount of these requests to be only at the beginning of the session. We found this solution. Unfortunately it didn't change anything and we keep getting this 401 response (which consumes time). In order to see the traffic i first used the Fiddler app. Somehow, when I use Fiddler, there is only 1 authentication process at the beginning of the session (exactly as I wish), but when I close Fiddler and check the traffic via WireShark I can see that I still have this 401 response for each request. The used clients are IE6, IIS version 6. Can someone advise? iis iis-6 ntlm http-status-code-401 share|improve this question edited Sep 22 '11 at 15:39 Dennis G 15.2k1163116 asked Aug 3 '09 at 13:58 Satumba 3691417 add a comment| 6 Answers 6 active oldest votes up vote 15 down vote accepted NTLM/Negotiate, unlike all other HTTP authentication schemes, are connection-oriented protocols. In IIS, there are various settings which control whether authentication will be demanded for all requests on a previously authenticated connectio
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10 Pull requests 3 Projects 0 Pulse Graphs New issue Error 401 #65 http 401 challenge Open jeeberhardt opened this Issue Nov 15, 2015 · 21 comments Projects None yet Labels None yet Milestone No milestone http://stackoverflow.com/questions/1222506/avoiding-401-response-for-each-request-using-ntlm Assignees No one assigned 5 participants jeeberhardt commented Nov 15, 2015 I have an error 401 when I try to connect to https://xxxxx.fr/ews/exchange.asmx. It works with curl (or pycurl) but not with requests-ntlm. Thank you for your answer! $ pip freeze | grep requests requests==2.8.1 https://github.com/requests/requests-ntlm/issues/65 requests-ntlm==0.2.0 Curl: #$DATA contains the xml in the python code curl -s -u USERNAME:XXXX:XXXX -L https://xxxxx.fr/ews/exchange.asmx -d "$DATA" -H "Content-Type:text/xml" --ntlm Python: import requests from requests_ntlm import HttpNtlmAuth url = 'https://xxxxx.fr/ews/exchange.asmx' username = 'DOMAIN.fr\\USERNAME' password = 'XXXX:XXXX' headers = {'Content-Type': 'text/xml'} data = '''
RamaswamySeptember 20, 201336 0 0 0 Overview and working of NTLM Why NTLM: Microsoft adopted Kerberos as the preferred authentication protocol for Windows 2000 and subsequent Active Directory domains. Kerberos is typically used when https://blogs.msdn.microsoft.com/chiranth/2013/09/20/ntlm-want-to-know-how-it-works/ a server belongs to a Windows Server domain, or if a http://sharepoint.stackexchange.com/questions/22256/http-401-twice-before-http-200-when-serving-files trust relationship with a Windows Server Domain is established in some other way (such as Linux to Windows AD authentication). But NTLM can be used in either case(if you have a active directory or not). NTLM is still used in the following situations: The client is error 401 authenticating to a server using an IP address The client is authenticating to a server that belongs to a different Active Directory forest that has a legacy NTLM trust instead of a transitive inter-forest trust The client is authenticating to a server that doesn't belong to a domain No Active Directory domain exists (commonly referred to as error 401 ntlm "workgroup" or "peer-to-peer") Where a firewall would otherwise restrict the ports required by Kerberos (typically TCP 88) Working of NTLM in general words: The following steps present an outline of NTLM non-interactive authentication. The first step provides the user's NTLM credentials and occurs only as part of the interactive authentication (logon) process. 1. (Interactive authentication only) A user accesses a client computer and provides a domain name, user name, and password. The client computes a cryptographic hash of the password and discards the actual password. 2. The client sends the user name to the server (in plaintext). 3. The server generates a 16-byte random number, called a challenge or nonce, and sends it to the client. 4. The client encrypts this challenge with the hash of the user's password and returns the result to the server. This is called the response. 5. The server sends the following three items to the domain controller: ◦User name ◦Challenge sent to the client ◦Response received from the client 6. The domain cont
for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us SharePoint Questions Tags Users Badges Unanswered Ask Question _ SharePoint Stack Exchange is a question and answer site for SharePoint enthusiasts. Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top HTTP 401 twice before HTTP 200 when serving files up vote 19 down vote favorite 6 I've built a Javascript web application which is served from Sharepoint (ie. there is no Sharepoint code at all operating on the web app, it's just some HTML/JS being served from a Sharepoint 2010 Document Library) I'm displaying HTML5 video and sourcing a file from within the same Document Library, this works absolutely fine on Google Chrome, but if I try with Firefox (or with IE9) then every file I source gets denied twice with an HTTP 401 error before it gets returned with HTTP 200. The upshot of this is that if I have a very simple HTML file (see below) and run it locally then the video plays fine in all browsers, if I upload the HTML and the video to my company's sharepoint server (into a document library) then it won't load in IE or Firefox - but works fine in Chrome!
If I change the source element to reference a video file on a different server then it, again, works fine so this must be a problem with the way Sharepoint is serving files. Does anyone have any advice on how to work around this problem? Either in Sharepoint or in JS? T