IIS7 deployment - duplicate system web extensions scripting scriptResourceHandler section

Question

On attempting to deploy a  net 3 5 website on the default app pool in IIS7 having the framework section set to 4 0  I get the following error      There is a duplicate    system web extensions scripting scriptResourceHandler  section   defined    Commenting off the offending lines didn t help either  Any pointers on what I need to do or look at

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In my case it happened after I converted the whole solution  using an extension called Target Framework Migrator  to 4 6 2 but ended up undoing the changes and going back to 3 5  solution is versioned by TFS   To solve this  I converted just the problematic project  which was using IIS Express to run  to 4 6 2 and then back to 3 5

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I ve solved it  doing the following steps     I created a new application s group in IIS   Open advanced settings for the site or web application that is having this problem   And set the new application s group    Here you have the images of these steps

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Another way to avoid this problem that may help others is build your  net web service to version 4 0 or higher if possible

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My resolution was kind of stupid    I installed a copy of  net 3 5 Created another app pool and selected  net 3 5  it says 2 0 5077 in the drop down  Added my website to that app pool Recycled the old and new pools and the site started working    It came down to me not having 3 5 installed even though the turn on windows features said I did and creating another app pool to use  I hope this helps others

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Set the application pool to 2 0  I did it and worked

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Apparently  other have  had  this problem  They rebuild in Framework 4 0  Can you   Also  see this about making sure your IIS is fresh

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This is maybe the wrong answer for you  But this was the first hit on Google when I tried to solve my problem  With that said    The same error message occurred for me as well  but when I tried to run IIS Express through Visual Studio  My problem was that I mistakenly commited my applicationhost config to TFS  Later when I tried to run the project on my laptop after getting the latest commits  that s when the error occurred  I found that the virtual directory path was wrong   lt virtualDirectory path  quot   quot  physicalPath  quot C  Users user1 Documents Visual Studio 2015 Projects ProjectName ProjectName ProjectName Web quot    gt   Hope that this help somebody  This is my first post  so be gentle

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If your plan is to deploy to an IIS that has an Application Pool running in  net 4 0 you will need to cleanup the web config that includes all the section Definitions that point to  net 3 5  The reason this fails is because these section definitions are already included in the root web config in  NET 4 0  see  windir  microsoft net framework v4 0 30319 config machine config  that include all the system web extensions declared already   Another quick fix is to have the application pool set to 2 0 just as your development machine appears to have

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In my case I wanted to manually add urlrewrite rule and couldn t see the obvious error  I missed  lt rules gt  tag    wrong code                         lt rewrite gt         lt rule name  some rule  stopProcessing  true  gt           lt match url  some-pattenr         gt                   lt action type  Redirect  url   some-ne-pattenr  R 1     gt         lt  rule gt       lt  rewrite gt          lt  system webServer gt   lt  configuration gt    proper code  with rules tag                          lt rewrite gt         lt rules gt           lt rule name  some rule  stopProcessing  true  gt             lt match url  some-pattenr         gt                     lt action type  Redirect  url   some-ne-pattenr  R 1     gt           lt  rule gt         lt  rules gt       lt  rewrite gt      lt  system webServer gt   lt  configuration gt

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Necromancing   If you don t have any system web extensions config-sections or handler module entries in your web config  this problem is caused because you somebody else copied a VisualStudio-Project  2013 2015 2017  while having hidden-files unhidden    Because of that  it will not only copy  git  but also  VS  which contains an IIS-Express  applicationhost config file  which points to web config files at paths that don t exist  or worse  paths that do exist  but do not have the same content       Solution   Delete the applicationhost config file in the  VS folder   Or just delete the  VS folder altogether   Visual Studio will re-create it

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My app was an ASP Net3 5 app  using version 2 of the framework   When ASP Net3 5 apps got created Visual Studio automatically added scriptResourceHandler to the web config  Later versions of  Net put this into the machine config  If you run your ASP Net 3 5 app using the version 4 app pool  depending on install order this is the default app pool   you will get this error    When I moved to using the version 2 0 app pool  The error went away  I then had to deal with the error when serving WCF  svc    HTTP Error 404 17 - Not Found The requested content appears to be script and will not be served by the static file handler  After some investigation  it seems that I needed to register the WCF handler  using the following steps    open Visual Studio Command Prompt  as administrator  navigate to  C  Windows Microsoft NET Framework v3 0 Windows Communication Foundation  Run servicemodelreg -i

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This error message seems to come up in various situations    In my case  on top of my application s Web Config file I had an extra Web Config file in the root folder  C  Inetpub www root   Probably left there after some testing  I had forgotten all about it  and couldn t figure out what the problem was   Removing it solved the problem for me

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The solution for me was to change the  NET framework version in the Application Pools from v4 0 to v2 0 for the Default App Pool

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If  like me  you need to target v4 but can only build with  net 3 5  follow the instruction here  Just replace in your web config the whole content of the  lt configSections gt  with    lt configSections gt   lt sectionGroup name  system web extensions  type  System Web Configuration SystemWebExtensionsSectionGroup  System Web Extensions  Version 4 0 0 0  Culture neutral  PublicKeyToken 31bf3856ad364e35  gt     lt sectionGroup name  scripting  type  System Web Configuration ScriptingSectionGroup  System Web Extensions  Version 4 0 0 0  Culture neutral  PublicKeyToken 31bf3856ad364e35  gt       lt section name  scriptResourceHandler  type  System Web Configuration ScriptingScriptResourceHandlerSection  System Web Extensions  Version 4 0 0 0  Culture neutral  PublicKeyToken 31bf3856ad364e35  requirePermission  false  allowDefinition  MachineToApplication   gt       lt sectionGroup name  webServices  type  System Web Configuration ScriptingWebServicesSectionGroup  System Web Extensions   Version 4 0 0 0  Culture neutral  PublicKeyToken 31bf3856ad364e35  gt         lt section name  jsonSerialization  type  System Web Configuration ScriptingJsonSerializationSection  System Web Extensions  Version 4 0 0 0  Culture neutral  PublicKeyToken 31bf3856ad364e35  requirePermission  false  allowDefinition  Everywhere   gt         lt section name  profileService  type  System Web Configuration ScriptingProfileServiceSection  System Web Extensions  Version 4 0 0 0  Culture neutral  PublicKeyToken 31bf3856ad364e35  requirePermission  false  allowDefinition  MachineToApplication   gt         lt section name  authenticationService  type  System Web Configuration ScriptingAuthenticationServiceSection  System Web Extensions  Version 4 0 0 0  Culture neutral  PublicKeyToken 31bf3856ad364e35  requirePermission  false  allowDefinition  MachineToApplication   gt         lt section name  roleService  type  System Web Configuration ScriptingRoleServiceSection  System Web Extensions  Version 4 0 0 0  Culture neutral  PublicKeyToken 31bf3856ad364e35  requirePermission  false  allowDefinition  MachineToApplication   gt       lt  sectionGroup gt     lt  sectionGroup gt   lt  sectionGroup gt

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In my case I had 2 different apps sharing the same app pool  The first one was using the  net4 5 framwork and the new one was using 2 0  When I changed the second app to it s own app pool it starting working fine with no changes to the web config

[asp.net] IIS7 deployment - duplicate 'system.web.extensions/scripting/scriptResourceHandler' section

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