401 Unauthorized Access is denied due to invalid credentials

Question

I am using IIS Express to deploy MVC4 application  This website runs perfectly on same computer  But in Lan it gives me error 401     lt authentication mode  Forms  gt       lt forms loginUrl      slidingExpiration  true  timeout  20  gt       lt  forms gt   lt  authentication gt    In home controller    HttpPost   AllowAnonymous          public ActionResult Index LoginModel model  string returnUrl        I am starting IIS server from command prompt in Administrator mode   IIS responds to the request with error 401    Any clue

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In my case  what made it work was changing the Anonymous User identity from Specific user  IUSR  to Application Pool Identity  Weird enought because other sites are using the specific user IUSR and work fine

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i faced the same issue under IIS 8 5  A working solution for me was changing the IIS to display detailled errors  See answer from sna2stha  But i think it is not a good idea to forward detailed error messages to browsers in production enviroments  I added changed the existingResponse attribute in the httpErrors-Section  so the IIS not handled any extisting Asp net Response    lt system webServer gt      lt httpErrors existingResponse  PassThrough    gt   lt  system webServer gt    This works for me

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I had a permissions issue to a website and just couldn t get Windows authentication to work   It was a folder permissions rather than ASP NET configuration issue in the end and once the Everyone user was granted permissions it started working

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In my case   My application is developed in MVC and my home controller class was decorated with  Authorize  which was causing this issue   So I ve removed it because my application don t require any authentication

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In case anyone is still looking for this  this solved the problem for us   To whoever this may help  this saved my life     IIS 7 was difficult for figuring out why i was getting the 401 - Unauthorized  Access is denied due to invalid credentials    until i did this      Open IIS and select the website that is causing the 401 Open the  Authentication  property under the  IIS  header Click the  Windows Authentication  item and click  Providers  For me the issue was that Negotiate was above NTLM  I assume that there was some kind of handshake going on behind the scenes  but i was never really authenticated  I moved the NTLM to the top most spot  and BAM that fixed it    Here is the link where this was found

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I faced this error when I created an empty project with the MVC folders and then deployed the application to the server  My issue was that I didn t define the authentication in Web config  so all I had to do was add this line to a system web tag    lt system web gt       lt authentication mode  None   gt   lt  system web gt

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I realize its an old question  but this came up in my searches  Had a similar issue for an MVC application recently built  deployed for the first time  and Authentication mechanism wasn t completely hashed out   It wasn t an IIS setting in my case  it was a Controller that was not  AllowAnonymous  decorated  I was using a Render Action Html Action in a Layout cshtml and the User was unauthenticated  So the Layout tried to load an Authenticated Action in an UnAuthenticated context   Once I updated the action to AllowAnonymous  the problem went away  and this is what led me to it   Hope this helps someone

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I faced similar issue   The folder was shared and Authenticated Users permission was provided  which solved my issue

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I realize this is an older post but I had the same error on IIS 8 5  Hopefully this can help another experiencing the same issue  I didn t see my issue outlined in other questions with a similar title    Everything seemed set up correctly with the Application Pool Identity  but I continued to receive the error  After much digging  there is a setting for the anonymous user to use the credentials of the application pool identity or a specific user  For whatever reason  mine was defaulted to a specific user  Altering the setting to the App Pool Identity fixed the issue for me    IIS Manager   Sites   Website Double click  Authentication  Select Anonymous Authentication From the Actions panel  select Edit Select Application pool Identity and click ok   Hopefully this saves someone else some time

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I had this issue on IIS 10  This is how I fixed it   Open IIS Select The Site Open Authentication Edit Anonymous Authentication Select Application Pool Identity

User · Answer

If you re using IIS 7 do something like this   Select your site  Click on error pages  Edit feature settings  Select detailed errors

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Make sure that you enabled anonymous authentication on iis like this

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I had a slightly different problem  The credential problem was for the underlying user running the application  not the user trying to login  One way to test this is to go to IIS Management -  Sites -  Your Site -  Basic Settings -  Test Settings

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I had a similar issue today  For some reason  my GET request was fine  but PUT request was failing for my WCF WebHttp Service  Adding the following to the Web config solved the issue    lt system web gt     lt authentication mode  Forms    gt    lt  system web gt

[asp.net-mvc] 401 Unauthorized: Access is denied due to invalid credentials

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