ASP NET Web API application gives 404 when deployed at IIS 7

Question

I have an ASP NET Web API which works fine when running on  IIS Express  with localhost 1783    But when I uncross the  Use IIS Express  and then press  Create Virtual Directory           I just get 404 errors    Any ideas whats wrong  Thanks

User · Answer

I had  as same problem   afer  lot of R amp D i found  the problem   but  as long as your configuration are finne mean that aspnet 64 bit and the IIS well then the only problem i saw is the path   web api taking the local  directiry path  so that you need to avid it  by like  this             api products   thank you very much for posting the problem  i leanred alot abt iis and other setting in config file

User · Answer

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

User · Answer

While the marked answer gets it working  all you really need to add to the webconfig is        lt handlers gt         lt  -- Your other remove tags-- gt         lt remove name  UrlRoutingModule-4 0   gt         lt  -- Your other add tags-- gt         lt add name  UrlRoutingModule-4 0  path     verb     type  System Web Routing UrlRoutingModule  preCondition     gt       lt  handlers gt    Note that none of those have a particular order  though you want your removes before your adds   The reason that we end up getting a 404 is because the Url Routing Module only kicks in for the root of the website in IIS   By adding the module to this application s config  we re having the module to run under this application s path  your subdirectory path   and the routing module kicks in

User · Answer

For me  in addition to having runAllManagedModulesForAllRequests  true  I also had to edit the  path  attribute below   Previously my path attribute was      which means it only executed on url s containing a dot character   However  my application s url s don t contain a dot   When I switched path to     then it worked  Here s what I have now      lt system webServer gt         lt validation validateIntegratedModeConfiguration  false    gt         lt modules runAllManagedModulesForAllRequests  true  gt         lt remove name  WebDAVModule   gt         lt  modules gt          lt handlers gt             lt remove name  WebDAV    gt             lt remove name  ExtensionlessUrlHandler-ISAPI-4 0 32bit    gt             lt remove name  ExtensionlessUrlHandler-ISAPI-4 0 64bit    gt             lt remove name  ExtensionlessUrlHandler-Integrated-4 0    gt             lt add name  ExtensionlessUrlHandler-ISAPI-4 0 32bit  path     verb     modules  IsapiModule  scriptProcessor   windir  Microsoft NET Framework v4 0 30319 aspnet isapi dll  preCondition  classicMode runtimeVersionv4 0 bitness32  responseBufferLimit  0    gt             lt add name  ExtensionlessUrlHandler-ISAPI-4 0 64bit  path     verb     modules  IsapiModule  scriptProcessor   windir  Microsoft NET Framework64 v4 0 30319 aspnet isapi dll  preCondition  classicMode runtimeVersionv4 0 bitness64  responseBufferLimit  0    gt             lt add name  ExtensionlessUrlHandler-Integrated-4 0  path     verb     type  System Web Handlers TransferRequestHandler  preCondition  integratedMode runtimeVersionv4 0    gt         lt  handlers gt     lt  system webServer gt

User · Answer

For me I received a 404 error on my websites NOT using IIS Express  using Local IIS  while running an application that WAS using IIS Express  If I would close the browser that was used to run IIS Express  then the 404 would go away  For me I had my IIS Express project calling into Local IIS services  so I converted the IIS Express project to use Local IIS and then everything worked  It seems that you can t run both a non-IIS Express and Local IIS website at the same time for some reason

User · Answer

I you are using Visual Studio 2012  download and install Update 2 that Microsoft released recently  as of 4 2013    Visual Studio 2012 Update 2  There are some bug fixes in that update related to the issue

User · Answer

I have been battling this problem for a couple of days trying all kinds of things suggested  My dev machine was working fine  but the new machine I was deploying to was giving me the 404 error    In IIS manager  I compared the handler mappings on both machines to realize that a lot of handlers were missing  Turns out that ASP Net 5 was not installed on the machine

User · Answer

Some people say runAllManagedModulesForAllRequests  true  will have performance issues and MVC routing issues  They suggest to use the following               http   www britishdeveloper co uk 2010 06 dont-use-modules-runallmanagedmodulesfo html  http   bartwullems blogspot com 2012 06 optimize-performance-of-your-web html

User · Answer

Spend a whole week  after all the following setting worked   and finally saved  Removing the UrlScan from ISAPI fileters in IIS fixes the problem in our case

User · Answer

You may need to install Hotfix KB980368   This article describes a update that enables certain Internet Information Services  IIS  7 0 or IIS 7 5 handlers to handle requests whose URLs do not end with a period  Specifically  these handlers are mapped to  quot   quot  request paths  Currently  a handler that is mapped to a  quot   quot  request path handles only requests whose URLs end with a period  For example  the handler handles only requests whose URLs resemble the following URL  http   www example com ExampleSite ExampleFile  After you apply this update  handlers that are mapped to a  quot    quot  request path can handle requests whose URLs end with a period and requests whose URLs do not end with a period  For example  the handler can now handle requests that resemble the following URLs  http   www example com ExampleSite ExampleFile http   www example com ExampleSite ExampleFile  After this patch is applied  ASP NET 4 applications can handle requests for extensionless URLs  Therefore  managed HttpModules that run prior to handler execution will run  In some cases  the HttpModules can return errors for extensionless URLs  For example  an HttpModule that was written to expect only  aspx requests may now return errors when it tries to access the HttpContext Session property

User · Answer

For me  this issue was slightly different than other answers  as I was only receiving 404s on OPTIONS  yet I already had OPTIONS specifically stated in my Integrated Extensionless URL Handler options  Very confusing    As others have stated  runAllManagedModulesForAllRequests  true  in the modules node is an easy way to blanket-fix most Web API 404 issues - although I prefer  DavidAndroidDev  s answer which is much less intrusive  But there was something additional in my case  Unfortunately  I had this set in IIS under Request Filtering in the site      By adding the following security node to the web config was necessary to knock that out - full system webserver included for context      lt system webServer gt       lt modules runAllManagedModulesForAllRequests  true  gt         lt remove name  WebDAVModule    gt       lt  modules gt       lt handlers gt         lt remove name  ExtensionlessUrlHandler-Integrated-4 0    gt         lt remove name  OPTIONSVerbHandler    gt         lt remove name  TRACEVerbHandler    gt         lt remove name  WebDAV    gt         lt add name  ExtensionlessUrlHandler-Integrated-4 0  path      verb     type  System Web Handlers TransferRequestHandler  preCondition  integratedMode runtimeVersionv4 0    gt       lt  handlers gt       lt security gt         lt requestFiltering gt           lt verbs gt             lt remove verb  OPTIONS    gt           lt  verbs gt         lt  requestFiltering gt       lt  security gt     lt  system webServer gt    Although it s not the perfect answer for this question  it is the first result for  IIS OPTIONS 404  on Google  so I hope this helps someone out  cost me an hour today

[asp.net] ASP.NET Web API application gives 404 when deployed at IIS 7

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