HTTP 404 Page Not Found in Web Api hosted in IIS 7 5

Question

I have a Web Api application  It works perfectly well when I tested it using the VS 2010 debugging dev server  But I now deployed it to IIS 7 5 and I am getting a HTTP 404 error when trying to access the application   Here is my web config   lt  xml version  1 0  encoding  utf-8   gt   lt configuration gt     lt connectionStrings gt       lt add name  DefaultConnection  connectionString  Data Source   SQLEXPRESS Initial Catalog aspnet-FlowGearProxy-20123141219 Integrated Security True  providerName  System Data SqlClient    gt     lt  connectionStrings gt     lt appSettings gt       lt add key  webpages Version  value  2 0 0 0    gt       lt add key  webpages Enabled  value  true    gt       lt add key  PreserveLoginUrl  value  true    gt       lt add key  ClientValidationEnabled  value  true    gt       lt add key  UnobtrusiveJavaScriptEnabled  value  true    gt     lt  appSettings gt     lt system web gt       lt compilation debug  true  targetFramework  4 0    gt       lt authentication mode  Forms  gt         lt forms loginUrl    Account Login  timeout  2880    gt       lt  authentication gt       lt pages gt         lt namespaces gt           lt add namespace  System Web Helpers    gt           lt add namespace  System Web Mvc    gt           lt add namespace  System Web Mvc Ajax    gt           lt add namespace  System Web Mvc Html    gt           lt add namespace  System Web Routing    gt           lt add namespace  System Web WebPages    gt         lt  namespaces gt       lt  pages gt     lt  system web gt     lt system webServer gt       lt validation validateIntegratedModeConfiguration  false    gt       lt modules runAllManagedModulesForAllRequests  true    gt     lt  system webServer gt   lt  configuration gt

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I had to disable the File Publish Option  Precompile during publishing

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I struggled with this  as well   My exact issue was that I had an ASMX Web Service that  when I entered a parameter into a web method and tested it  then it would give me the 404   The particular method had worked fine in the past and hadn t been changed  only re-published   Then I got here and tried all of the posted answers  amp  nothing helped   My ultimate solution   I know this is drastic  but I just created a new Visual Studio solution and web project   Selected MVC  then I did an  Add     New Item   selected  Visual C      Web  and  Web Service  ASMX   under that   I copied all of my old code-behind code  then I took note of the namespace it gave the new file in my new project  then pasted all of my old code into the new code-behind file in the new project and put the namespace back to what it had been    Then I created my folders in my project that I had before using Visual Studio to do  Add     New Folder   then copied back in my files into the folders from my other project using Windows Explorer  then right-clicked each folder in Visual Studio and did  Add     Existing Item     and pulled the items in those folders into my new project s Visual Studio folders  I referenced all my  NET assemblies again  having both projects open so I could compare which ones I had referenced  previously  there were several    I had to name my new project slightly different - basically I did something comparable to  GeneralWebApp  instead of  MyWebApp   for example - so I had to do a  Replace All  in my whole solution to replace that name  so it would get the right namespace for all my files     Then I did a  Rebuild All  on the project  then started it up with the  Play  button Visual Studio gives when I got it to build correctly   It worked fine   So I published it  and everything was fine on the server where I published it  when I ran it from there   I have no explanation as to what happened  but that s how I got through it   It s not a bad test just to see if something Visual Studio is doing has mucked it up

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Are you running the Web API app in a virtual directory or an application   For example  I had the same issue when I moved my project to my local IIS under the Default Web Site   SampleWebAPI  I believe this is due to the change in the URL routing as follows   Original   localhost 3092 api values Moved      localhost SampleWebAPI api values  If you move the Web API project to it s own website running on a different port it seems to work   Additional note  I had further complicated the issue by adding api as the alias of an application within my website which caused the effective URL to be   localhost 81 api api values - noticed this after moving the website to it s own website   Therefore  because I wanted to maintain a separation between my website and the web api mvc project site  I changed the routing rules in global asax for the Web API  DefaultAPI  from api  controller   id  to  controller   id  and the ASP NET MVC one Default from  controller   id  to info  controller   id

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For me the problem was the root site was configured to use a  NET 2 0 app pool  and my application within that site was  NET 4 5   I created a new site with a  NET 4 app pool and placed my application at the root of that - and that worked fine

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For me the solution was removing the following lines from my web config file    lt dependentAssembly gt       lt assemblyIdentity name  System Net Http  publicKeyToken  b03f5f7f11d50a3a  culture  neutral    gt       lt bindingRedirect oldVersion  0 0 0 0-4 1 1 3  newVersion  4 1 1 3    gt   lt  dependentAssembly gt   lt dependentAssembly gt       lt assemblyIdentity name  Microsoft IdentityModel Tokens  publicKeyToken  31bf3856ad364e35  culture  neutral    gt       lt bindingRedirect oldVersion  0 0 0 0-5 5 0 0  newVersion  5 5 0 0    gt   lt  dependentAssembly gt    I noticed that VS had added them automatically  not sure why

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Try this webconfg   replace  NewsApi dll  with your main dll     lt  xml version  1 0  encoding  utf-8   gt   lt configuration gt     lt location path     inheritInChildApplications  false  gt       lt system webServer gt         lt handlers gt           lt add name  aspNetCore  path     verb     modules  AspNetCoreModule  resourceType  Unspecified    gt         lt  handlers gt         lt aspNetCore processPath  dotnet  arguments    NewsApi dll  stdoutLogEnabled  false  stdoutLogFile    logs stdout    gt       lt  system webServer gt     lt  location gt   lt  configuration gt

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This is the only answer that worked for me     I had a similar issue    It seemed like no matter what I did  nothing was getting redirected and my global file was just being ignored  I seriously considered just ending it all before I found this answer  I hope this link helps somebody else    Stack Overflow - Diagnosing 404 errors on IIS 7 and ASP NET MVC     Adding the following to the web config file worked for me    lt system webServer gt     lt modules gt       lt remove name  UrlRoutingModule-4 0    gt       lt add name  UrlRoutingModule-4 0  type  System Web Routing UrlRoutingModule  preCondition      gt     lt  modules gt   lt  system webServer gt    system webServer tag was already there of course but I added the modules tag to it and then the remove  amp  add tags to modules tag

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i do nothing  just add this tag in web config  its working this issue come up one of the following points   Use Web Api in the same project using MVC or asp net forms Use RouteConfig and WebApiConfig in Global asax as         GlobalConfiguration Configure WebApiConfig Register           RouteConfig RegisterRoutes RouteTable Routes   Use RouteConfig for 2 purposes  asp net forms using with friendlyurl and mvc routing for MVC routing   we just use this tag in web config  it will work    lt system webServer gt   lt modules runAllManagedModulesForAllRequests  true  gt                                lt  modules gt   lt  system webServer gt

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Ran into the same issue with Web API and  Net Core Web API   Worked fine in VS 2017 while debugging  but returned 404 when published to IIS 7 5   Solution for me was to change the way I created the site   Instead of publishing to the root of a Web Site  created by right clicking Sites   Add Web Site   I had to create an Application  created by right clicking a Web Site   Add Application  and publish to that folder   Note that for the Core version  I had to change the Application Pool  NET Framework Version setting to  No Managed Code

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This piece of configuration in web config file can help as helped to me  in the system webServer section          lt security gt             lt requestFiltering gt                 lt verbs applyToWebDAV  true  gt                     lt remove verb  PUT    gt                     lt add verb  PUT  allowed  true    gt                     lt remove verb  DELETE    gt                     lt add verb  DELETE  allowed  true    gt                     lt remove verb  PATCH    gt                     lt add verb  PATCH  allowed  true    gt                 lt  verbs gt             lt  requestFiltering gt         lt  security gt

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What kind of HTTP request are you making    This is a slightly left-field answer but have you tried removing the IIS default error page for 404 to check what your API is actually returning    I had an issue whereby I wanted a controller method to return a 404 when I POSTed the wrong id to it  I found that I was always getting the IIS 404  File or directory not found  page rather than the HTTP response from my API  Removing the default 404 error page resolved the problem   Different issue but you never know it may help

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Had same issue  This configuration setting solved the issue    lt system webServer gt                 lt modules runAllManagedModulesForAllRequests  true    gt             lt  system webServer gt    As explained in http   www britishdeveloper co uk 2010 06 dont-use-modules-runallmanagedmodulesfo html above solution should be avoided  Use this instead   Same solution is provided by Lopsided also  Keeping it here to let users avoid implementing the first working solution     lt modules gt     lt remove name  UrlRoutingModule-4 0    gt     lt add name  UrlRoutingModule-4 0  type  System Web Routing UrlRoutingModule  preCondition      gt     lt  -- any other modules you want to run in MVC e g  FormsAuthentication  Roles etc  -- gt   lt  modules gt

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This is a really obvious answer rookie mistake  but I thought I would just put it here in case it might help someone   So my structure was that a had a Website in IIS with the frontend as one application underneath the website and the backend was the other   The backend application had six seperate api applications sitting beneath it   I had forgotten to convert each of the api folders to applications within IIS and of course this was causing the routes to my api endpoints to return a 404 0 error   My Point  Check the simple stuff first  Make sure that you have converted all folders to applications in IIS where that is required for your website to function correctly

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Had the same issue  a 404 response for the web api controllers when served from the IIS but everything worked fine from VS2010  None of the above solutions worked for me  Eventually I found that the problem was that we added WSE 3 0 support for the application and the Microsoft Web Services3 dll was missing in the application s  bin directory  Weird  but after copying the dll  the route mapping started to work

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It got resolved for me  when I enable checkbox for UrlRoutingModule-4 0   IIS Manager   Modules   select UrlRoutingModule-4 0   Edit Module   check the check-box  Invoke only for requests to ASP NET applications or managed handlers

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If you place only the bin folder in IIS  after building the project   this problem will be occurred too  In this situation you should publish the project using VisualStudio  then place the published folder into IIS

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I recently had a 404 not found error with all my Web Api 2 routes controllers  So I went onto the actual server and tried to browse using localhost instead of the hostname and got  404 7 Not Found -  The request filtering module is configured to deny the file extension    This SO post help me solve it

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A few things to check    Make sure that you have the  NET Framework 4 installed  Ensure that version 4 of the  NET Framework is selected for your website  amp  virtual directory  if applicable   Ensure that you have MVC installed or have the appropriate DLLs in your bin directory  Might need to allow ASP NET 4 0 web service extensions Put the application in it s own app pool  Make sure the directory has at least  Scripts Only  execute permissions

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I also ran into this problem   I solved the problem by going to the Application Pools   Application Pool Name and changed the  NET Framework from version v 2 0 50727 to v4 0 30319

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I had a similar issue because I did not define routing correctly for web api  Here is my solution   public class Global   System Web HttpApplication               void Application Start object sender  EventArgs e                        GlobalConfiguration Configuration Routes MapHttpRoute                  name   DefaultApi                   routeTemplate   api  controller   id                    defaults  new   id   System Web Http RouteParameter Optional                             These pages helped me   https   docs microsoft com en-us previous-versions aspnet hh834746 v vs 118  redirectedfrom MSDN  https   docs microsoft com en-us aspnet web-api overview advanced configuring-aspnet-web-api

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I was struggling with this as well   Fortunately  Steve Michelotti documented a solution that worked for me here   At the end of the day  I enabled all verbs  verb      to the ExtensionlessUrlHandler-Integrated-4 0 handler in my web config    lt system webServer gt       lt validation validateIntegratedModeConfiguration  false    gt       lt modules runAllManagedModulesForAllRequests  true    gt           lt handlers gt               lt remove name  ExtensionlessUrlHandler-Integrated-4 0    gt               lt add name  ExtensionlessUrlHandler-Integrated-4 0  path      verb     type  System Web Handlers TransferRequestHandler  resourceType  Unspecified  requireAccess  Script  preCondition  integratedMode runtimeVersionv4 0    gt           lt  handlers gt   lt  system webServer gt    Others have pointed out that having WebDAV enabled causes issues   Fortunately  I did not run into that issue as well

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I had the same issue  on a newly installed machine with Visual Studio 2013  the web api project was working under IISExpress  but not under local IIS  I tried everything I could find  but in the end the problem was not necessary with Web API  but with MVC  even it was installed  no MVC project was running   What worked for me was to uninstall IIS  from ADD REMOVE Windows Features   then reinstall it  and then run aspnet regiis -i  Maybe this helps somebody else

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Don t forget to deploy global asax

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I had a similar problem  I had the right settings in my web config file but was running the application pool in Classic mode rather than Integrated mode

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There is official fix from microsoft  http   support microsoft com kb 980368  I strongly do NOT recommend to use  lt  modules runAllManagedModulesForAllRequests  true    This leads all requests  even  jpg   css   pdf  etc  will be processed by all registered HTTP modules  There are two negative moments  a  additional load on hardware resources  b  potential errors  as http modules will process new type of content

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Please make sure the application pool is in Integrated mode And add the following  to web config file    lt system webServer gt                 lt modules runAllManagedModulesForAllRequests  true    gt             lt  system webServer gt

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I spent lot s of time trying a lot of things to finally realise I was adding my web app not in Sites Default Web Sites  but in another website binded to another port  Obviously trying localhost on port 80 would give a 404

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In my case  the issue was simply that I was trying to access the site at  myserver myintranet com mysite  But the web site binding for http in IIS didn t have the host name specified in the binding  It had worked before and I have no idea how that got blown away   Once I put myserver myintranet com into the host name the 404 was gone   In IIS Manager you go into Bindings    in the actions pane  then edit the http binding to specify the host name

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None of the above worked for me  Finally it wasn t anything related to any configuration  I was getting the 404 error while trying to run a debug session through Visual Studio 2017 using the built in IISExpress 10 0  For me it was working when the release was published to the IIS server but getting a 404 when debugging locally through VS  The issue turned out to be some old compiled files lying in the project bin directory which appeared to be interfering  Finally did a  quot Clean solution quot   closed VS  deleted the bin and obj folder  Restarted VS and rebuild project and the error went away

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This issue can also happen due to the following   1 In the Web Config   lt system webServer gt        lt modules runAllManagedModulesForAllRequests  true    gt    lt system webServer gt    2 Make sure the following are available in the bin folder on the server where the Web API is deployed   System Net Http System Net Http Formatting System Web Http WebHost System Web Http   These assemblies won t be copied in the bin folder by default if the publish is through Visual Studio because the Web API packages are installed through Nuget in the development machine  Still if you want to achieve these files to be available as part of Visual Studio publish then you need to set CopyLocal to True for these Assemblies  Sadish Kumar V

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If IIS is installed or enabled after ASP NET  you will need to manually register ASP NET with IIS in order for your  NET application to work   For Windows 7 and earlier    Run the Command Prompt  cmd exe  as an administrator  Navigate to the appropriate  NET Framework location   e g  C  Windows Microsoft NET Framework64 v4 0 30319  Run aspnet regiis exe -i   For Windows 8 and later    From the start menu  type  Turn windows features on or off  and select the first result  Expand Internet Information Services  World Wide Web Services  Application Development Features and select ASP NET 4 5  or ASP NET 3 5 if you need to support projects on  NET Framework 2 0-3 5   Click OK

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I started getting 404 responses from Web API after following a Windows Azure tutorial that told me to add a file  WebRole cs  to my project   After removing  WebRole cs  from my project  my Web API calls started working again

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Based on this SO answer  I just had to change path      to path     for the added ExtensionlessUrlHandler-Integrated-4 0 in configuration gt system WebServer gt handlers in my web config  Before    lt add name  ExtensionlessUrlHandler-Integrated-4 0  path      verb     type  System Web Handlers TransferRequestHandler  preCondition  integratedMode runtimeVersionv4 0    gt    After    lt add name  ExtensionlessUrlHandler-Integrated-4 0  path     verb     type  System Web Handlers TransferRequestHandler  preCondition  integratedMode runtimeVersionv4 0    gt

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Ensure that not selected Solution -  Project -  Right click Properties -  Application -  Auto-generate binding redirects

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