I have local Web API project which is NOT running through local IIS. To run the project I use F5 in Visual Studio 2013.
Using Fiddler, I keep getting:
HTTP/1.1 401 Unauthorized
# Result Protocol Host URL Body Caching Content-Type Process Comments Custom 88 401 HTTP localhost:52787 /api/values 6,180 private text/html; charset=utf-8 fiddler:10724
I know I am supposed to get 200 but I am not. Where should I check what I am doing wrong?
Here is a screenshot from a browser. I am getting this when I go back to Fiddler to see the results, I just type http://localhost:52787/api/helloapi into URL (in a browser) and press enter:
And here is what I get when I go through Fiddler manually composing GET:
I have the option Automatically Authenticate checked.
ekad
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asked Oct 13, 2014 at 22:40
5
When you say «using Fiddler», what exactly do you mean?
If you are manually composing the request using Fiddler’s Composer, either add an Authorization header yourself, or click the Composer’s Options tab and check the Automatically Authenticate box.
answered Oct 14, 2014 at 14:30
EricLawEricLaw
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I just had the same Problem. In my case it was caused by a deny clause in the web.config that forced all users to be authenticated. This works well in a browser because this handles the authentication behind the scenes and sends an appropriate authorization Cookie. In Fiddler this handshake does not take place and hence the 401. In the development environment add this to your web.config and it should work.
<system.web>
<authorization>
<allow users="?" />
</authorization>
</system.web>
answered Jan 31, 2015 at 7:14
I know this is an older post but if someone is still looking for an answer (like me) and the above answers did not resolve the problem then try this solution —
The above answers didn’t work in my dev env which consists of VS 2017 and VSTS as I already had the <authorization> element set correctly in my web.config file. After a few hit and trials I figured that the source of the problem was somewhere else.
I needed to make the following change to «applicationhost.config» file which can be usually found under the path «C:\Users\xxx\Source\Repos\yyy\yyy\.vs\config» —
Locate the <anonymousAuthentication> element and make sure the «enabled» attribute is set to «true» as under:
<system.webServer>
<security>
<authentication>
<anonymousAuthentication enabled="true" />
<windowsAuthentication enabled="true" />
</authentication>
</security>
</system.webServer>
answered Sep 26, 2018 at 17:20
AV2000AV2000
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It happens because you have an Authorize attribute on your ValuesController
[Authorize]
public class ValuesController : ApiController
Just remove [Authorize] attribute on ValuesController
answered Nov 22, 2019 at 6:57
Contents
- 1 Fiddler And The 401 Unauthorized Error With Asp Net Web Api Using Integrated Windows
- 2 Fix: Asp Core Jwt Authentication Always Throwing 401 Unauthorized After Token Generated
- 2.1 Conclusion
- 2.1.1 Related image with fiddler and the 401 unauthorized error with asp net web api using integrated windows
- 2.1.2 Related image with fiddler and the 401 unauthorized error with asp net web api using integrated windows
- 2.1 Conclusion
Embrace Your Unique Style and Fashion Identity: Stay ahead of the fashion curve with our Fiddler And The 401 Unauthorized Error With Asp Net Web Api Using Integrated Windows articles. From trend reports to style guides, we’ll empower you to express your individuality through fashion, leaving a lasting impression wherever you go. Not those my know user1930845 other of name in i user does don39t usersquot 13 oct have configured at i still users users 2014 authentication quot look controller for have this this name my does and i 13 it Oct work- there it where added is front where 2251 no at what 2254- authorize 2014 anywhere- i i api yes check- can in
Fiddler And The 401 Unauthorized Error With Asp Net Web Api Using
Fiddler And The 401 Unauthorized Error With Asp Net Web Api Using
Oct 13, 2014 at 22:51 yes i have this in front of api controller and i added users = my name in there [authorize (users=» my user name «)] it still does not work. what i don’t know is this where does it look for those users? where can i check. i have no other authentication configured anywhere. – user1930845 oct 13, 2014 at 22:54. So, the solution is quite simple. we just need to add the registry key backconnectionhostnames (important: multi value string) to hkey local machine\system\currentcontrolset\ control\lsa\msv1 0 section in the registry with the value localhost.fiddler.
C 401 Unauthorized Error Web Api Mvc Windows Authentication Itecnote
C 401 Unauthorized Error Web Api Mvc Windows Authentication Itecnote
Cause this behavior is by design. the 401.1 response will occur if the web browser’s first request that’s sent to the iis application contains one of the following headers: a windows challenge response (ntlm) header a negotiate www authorization header (known as pre authentication) note. Call web api with basic authentication always get 401 unauthorized from iis ask question asked 7 years ago modified 7 years ago viewed 16k times 6 tonight i come search some help about how to call a web api hosted in iis. everything work well in local from visual studio to iis express. but strangely, after publish on my iis server. Contact us. try for free. close mobile menu. configure fiddler troubleshooting. when connecting to a server protected with channel binding tokens (cbt), the server returns a series of 401 errors, and the browser continuously prompts for credentials. solution: configure fiddler classic to authenticate to a cbt protected server. in this article. Step 1. launch microsoft visual studio express 2013 for web step 2. file > new project > asp.net web application step 3, i named my new project hello123 and accepted the whatever default folder was offered step 4. selected web api template step 5. double clicked the valuescontroller.cs from the controllers folder step 6.
Asp Net Web Api Postman Fiddler Http Error 401 2 Unauthorized Error
Asp Net Web Api Postman Fiddler Http Error 401 2 Unauthorized Error
Contact us. try for free. close mobile menu. configure fiddler troubleshooting. when connecting to a server protected with channel binding tokens (cbt), the server returns a series of 401 errors, and the browser continuously prompts for credentials. solution: configure fiddler classic to authenticate to a cbt protected server. in this article. Step 1. launch microsoft visual studio express 2013 for web step 2. file > new project > asp.net web application step 3, i named my new project hello123 and accepted the whatever default folder was offered step 4. selected web api template step 5. double clicked the valuescontroller.cs from the controllers folder step 6. Developer tools and fiddler claim there were no cookies sent with the request. asp.net asp.net web api cors bearer token share improve this question follow asked oct 8, 2014 at 4:12 dale marshall 1,137 7 20 42 add a comment 2 answers sorted by:. Hopefully, this blog can help alleviate that pain for you. i will build the content here on top of my previous blog post which discusses how you can protect your web api with azure active directory. let’s dig in… when you use the [authorize] attribute to protect your web api controller as followed.
Fiddler And The 401 Unauthorized Error With Asp Net Web Api Using
Fiddler And The 401 Unauthorized Error With Asp Net Web Api Using
Developer tools and fiddler claim there were no cookies sent with the request. asp.net asp.net web api cors bearer token share improve this question follow asked oct 8, 2014 at 4:12 dale marshall 1,137 7 20 42 add a comment 2 answers sorted by:. Hopefully, this blog can help alleviate that pain for you. i will build the content here on top of my previous blog post which discusses how you can protect your web api with azure active directory. let’s dig in… when you use the [authorize] attribute to protect your web api controller as followed.
Correct The 401 Unauthorized Error Pctechguide
Correct The 401 Unauthorized Error Pctechguide
Fix: Asp Core Jwt Authentication Always Throwing 401 Unauthorized After Token Generated
in this video, i am going to show you, how to fix that types of status code that is «unauthorized» asp core jwt authentication in this video we will discuss how to test asp web api token based authentication using fiddler. text version of the video fixing a 401 unauthorized error | unauthorized error | how do i handle a 401 error in postman? #code #razorpay #coding c#: random 401 unauthorized errors using httpclient thanks for taking the time to learn more. in this video i’ll go through your today, i want to explain what the 401 error is, and how you can get rid of it. in a previous video i talked about what 404 error is. the hypertext transfer protocol (http) 401 unauthorized response status code indicates that the client request has not been lesson 2 of 26, a tuts course on asp at your service: web api taught by derek jensen. the full course is available at: 401 errors | what is a 401 error? | how to fix a 401 errors | web development |website maintenance in this video i will explain 401 error in tomcat, and how to fix tomcat 401 unauthorized problem. i will explain how to solve how to complete the unauthorized secret note challenge, which returns a status code of 401 unauthorized. issue a get request in this step by step tutorial, i show you how to secure a core api with jwt bearer authentication, using azure active
Conclusion
Taking everything into consideration, it is evident that article offers useful insights about Fiddler And The 401 Unauthorized Error With Asp Net Web Api Using Integrated Windows. Throughout the article, the author illustrates a deep understanding on the topic. Notably, the discussion of Z stands out as particularly informative. Thanks for taking the time to the article. If you have any questions, feel free to reach out through the comments. I am excited about your feedback. Furthermore, below are a few similar posts that you may find interesting:
Related image with fiddler and the 401 unauthorized error with asp net web api using integrated windows
Related image with fiddler and the 401 unauthorized error with asp net web api using integrated windows
I am requesting this url with fiddler: http://sitecollectionUrl/_api/web
With the header of:
Accept: application/json;odata=verbose
But I am getting 401 error code when doing so. I am on SharePoint Server 2013.
- rest
asked Dec 15, 2015 at 23:54
3
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Have you checked Automatically Authenticate option or you have key in the Authorization in header?
Dec 16, 2015 at 2:21
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How do I check the authentication automatically? No I don’t have a header for authentication.
Dec 16, 2015 at 6:06
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Thank you Mark, I found the automate authentication, and it worked. Please add it as answer so I can mark it
thank you a lotDec 16, 2015 at 6:11
thank you a lot1 Answer
You can enable the Automatically Authenticate option in Fiddler. It will use your current Windows logon account to send the request.
The option can be found under Composer tab > Options tab
answered Dec 16, 2015 at 6:15
Mark LMark L
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0
A few days ago I had a real strange problem while using HttpClient in combination with ASP.NET Web API and integrated windows authentication (IIS Express). To keep it simple, I always got a 401 (Unauthorized) error returned from the localhost website, even though I was setting up the HttpClient correctly (see screenshots) and the HttpClient was sending the authorization header (negotiate).
In my code is was using the URI http://localhost.fiddler:51275/api/values to access the REST API. The .fiddler part in the URI allows Fiddler to monitor the HTTP traffic between the website and the console application. For more details about this setting take a look at Fiddler’s homepage: http://www.fiddler2.com/fiddler/help/hookup.asp.
After researching a while I found out, that exactly the .fiddler URI addition is part of the problem for the 401 error I always received. Microsoft changed the logic of the NTLM authentication for some of the security classes in .NET version 3.5 SP1 (see link below) in order to avoid relefection attacks. A reflection attack is a method of attacking a challenge-response authentication system. The HttpClient uses those changed classes internally to connect to the website.
So, the solution is quite simple. We just need to add the registry key BackConnectionHostNames (important: Multi-Value String) to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\ Control\Lsa\MSV1_0 section in the registry with the value localhost.fiddler. A full explanation about the security concepts in WIA you will find at Microsoft’s site: Changes to NTLM authentication for HTTPWebRequest in Version 3.5 SP1
You can easily reproduce this error by creating a standard MVC4 web application with a Web API controller using windows authentication (see screenshot for settings). Then you add a console application to the project from which access the REST API (ValuesController).
- Veröffentlicht von in ASP.NET (MVC), ASP.NET (Web API), Development
- Schlagwörter: 401, 401 (Unauthorized), 401 error, ASP.NET Web API, Fiddler, HttpClient, Integrated Windows Authentication, NTLM authentication, REST API, WIA
I’m trying to use fiddler to generate requests to receive a JSON response. I drag a request that was captured from IE with a 200 response into the request builder then change the Accept header to «Accept: application/json».
After that I execute the request and get a 401 unauthorized response but the negotiation with a following 200 response does not take place. If there another way I can get this to work?
asked Jan 12, 2011 at 16:04
The reason I was heading down this path was to track down why my AJAX requests against the SharePoint 2010 WCF data services were not returning data while using the .getJSON method in jQuery. Turns out the SP2010 WCF data services escape single quotes in the JSON response.
Single quotes should not be escaped according to the JSON spec.
answered Jan 14, 2011 at 22:57
jjr2527jjr2527
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