The page you are requesting cannot be served because of the extension configuration error message

Question

I m getting this error message when trying to run my application  I don t know how to fix it      HTTP Error 404 3 - Not Found The page   you are requesting cannot be served   because of the extension   configuration  If the page is a   script  add a handler  If the file   should be downloaded  add a MIME map    Here s a screenshot of the error page    What can I do to fix this error

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Related to Server 2016  I should add    Run this command  aspnet regiis -lv from this dir  C  Windows Microsoft NET Framework v2 0 50727   This gives you the best view of what is going on On Server 2016  installing  net and iis out of sequence does not seem to be a problem  What is more likely to be a problem on Server 2016 is simply that asp net is not installed on the machine

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Running Windows Server 2008 R2 64bit and  net framework 4 5  ran this command from this location  and was successful   C  Windows Microsoft NET Framework64 v4 0 30319 gt aspnet regiis -i   output   Microsoft  R  ASP NET RegIIS version 4 0 30319 0 Administration utility to install and uninstall ASP NET on the local machine  Copyright  C  Microsoft Corporation   All rights reserved  Start installing ASP NET  4 0 30319 0         Finished installing ASP NET  4 0 30319 0

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Set video to your IIS MIME Type  This solved my problems   Ref  https   stackoverflow com a 8853443 8832133

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I fixed my issue on Windows 2012 server by Installing ALL WCF Features   A  Server Manager   Manage link top left    Add Roles and Features  B  In Features    Net Framework 4 5 Features   WCF Services  C  Check  enable  the features  I checked all   D  Install

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I too had this error  on Windows Server 2008 IIS 7  I had no visual studio installed so a reinstall   repair of  NET 4 0 did the trick

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I ve just had the same situation with my customer   We have our own product which installs a web site  The installer configures everything  the IIS pool  the site  web config  etc   We installed another web site using our installer   We entered the same parameters  so web configs happened to be the same in both sites    However  the newly installed site worked fine  while the old one didn t   Then I opened 2 IIS Manager windows and started comparing the difference in web site settings  And I found a problem   Somebody deleted all the Handler Mappings with the old site  If you go to  Handler mappings   you should see there aspx  asmx and other extensions and names of the handlers  So  in the old site all those records were missing    So  I would suggest first to check the  Handler mappings  - there must be a lot of records there  Create a new web site and compare to know how many should there be   Who deleted them  a person or another program  I have no idea  If somebody can tell if there exists some tracking application which would tell that user domain john was modifying web site at date  07 03 2012 12 34  that would be useful

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As  Mahmoodvcs mentioned i was require to set add MIME types for the file extension that I needed to host download directly  in this case is a Heroku s dump file  postgres s database backup   so in order to set a public IIS server where you can download this files without requiring AWS S3 bucket or HTTP shares like dropbox this is a terrific option      lt staticContent gt     lt mimeMap fileExtension   dump  mimeType  application octet-stream    gt   lt  staticContent gt

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I was trying to set up MediaWiki on my windows 7 pc and got this error    My solution was to  create a global FastCGI handler mapping for php

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Use aspnet regiis exe to register version of  NET framework you are using   This is a common issue and happens when IIS is installed after VS or  NET framework   Note - for Windows 8 10 users  see the other answer by JohnOpincar below  And also the comment tip from Kevin Brydon

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To add an extension to serve in IIS follow -   Open IIS Manager and navigate to the level you want to manage  In Features View  double-click MIME Types  In the Actions pane  click Add  In the Add MIME Type dialog box  type a file name extension in the File name extension text box      Type a MIME type in the MIME type text box  Click OK

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For Windows Server 2016    Open Server Manager form Manage -  Add Roles and Features Next until Features page Check WCF Services feature with all subfeatures Next and Install

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I fixed that on my Windows 10    Go to Control Panel - Programs and Features - Turn Windows features on or off  Select  NET Framework 4 6 Advanced Services - WCF Services Check HTTP Activation  OK done

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In my case I needed to add MIME types for each file extension that I wanted to serve to web config    lt system webServer gt       lt staticContent gt         lt mimeMap fileExtension   shp  mimeType  application octet-stream    gt         lt mimeMap fileExtension   dbf  mimeType  application octet-stream    gt         lt mimeMap fileExtension   kml  mimeType  text xml    gt       lt  staticContent gt           lt  system webServer gt

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By the way  I ve just found out this post  http   blogs msdn com b webtopics archive 2010 03 19 iis-7-5-how-to-enable-iis-configuration-auditing aspx it explains how to audit changes on IIS   For those who face similar problems I suggest to turn on auditing and later see why your site stopped working

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Verify that the application pool in IIS  in the case of IIS7 or above  is selected as integrated  In this case  probably change to Classic can solve this problem

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PHP 7 3 Application IIS on Windows Server 2012 R2  This was a two step process for me   1  Enable the WCF Services - with a server restart  2  Add a FASTCGI Module Mapping  1    Go to Server Manager   Add roles and features  Select your server from the server pool Go to Features   WCF Services  I selected all categories then installed  2    Go to IIS   selected the site In center pane select Handler Mappings Right hand pane select Add Module Mappings  Within the edit window   Request path    php  Module  FastCgimodule  Executable  I browsed to the php-cgi exe inside my PHP folder  Name  PHP7 3  Now that I think about it  There might be a way to add this handler mapping inside the web-config so if you migrate your site to another server you don t have to add this mapping over and over   EDIT  Here it is  Add this to the  section  of the web-config    lt add name  PHP-FastCGI  verb        path    php     modules  FastCgiModule    scriptProcessor  c  php php-cgi exe     resourceType  Either    gt

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In case this helps anyone   I was getting this error when attempting to run aspnet regiis exe      Operation failed with 0x8007000B      An attempt was made to load a program with an incorrect format   As it turns out  the server was running 2008 64 bit and I was trying to run the 32 bit version of the utility   Running the version found in  Windows Microsoft NET Framework64 v2 0 50727 fixed the issue   c  Windows Microsoft NET Framework64 v2 0 50727 gt aspnet regiis exe -i

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If you are trying to view an extensionless file what worked for me was adding a MIME Type  File name extension    MIME type  text plain  This might have some MVC implications  especially if your Static File Handler is above the Extensionless    handlers  under IIS   Handler Mappings  but might be a work around when you only need this temporarily  like activating SSL Certs

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In Windows 8 10  you have to use    Open Control Panel    Programs and Features    Turn Windows features on or off    Internet Information Services  IIS     World Wide Web Services    Application Development Features    Check the appropriate items  such as enabling ASP NET   i e install the appropriate version you want to configure your websites with    Reference  Check the solution of this question for reference

[asp.net] "The page you are requesting cannot be served because of the extension configuration." error message

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