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Thread: The configuration section 'system.web.extensions' cannot be read because it is missing a section declaration

Last post 05-03-2012 10:16 AM by Lars101. 22 replies.

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04-15-2010, 5:13 PM

petervdkerk
Joined on 02-01-2008, 4:34 PM
Posts 25

The configuration section 'system.web.extensions' cannot be read because it is missing a section declaration

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My system: I have installed Windows 7, VS2010 and .NET40 and ASPAJAXExtSetup.msi

I used to work with vs2008 and .NET3.5, after installing VS2010 I upgraded to .NET40. I dont think that is the issue here, but it might be something you need to know :)

My problem seems to arise from something within IIS, but I have no idea.

I'm getting the error below.

Error Summary

HTTP Error 500.19 - Internal Server Error

The requested page cannot be accessed because the related configuration data for the page is invalid.

Detailed Error Information

Module	IIS Web Core
Notification	Unknown
Handler	Not yet determined
Error Code	0x80070032
Config Error	The configuration section 'system.web.extensions' cannot be read because it is missing a section declaration
Config File	\\?\C:\inetpub\tickets\web.config

Requested URL	http://www.tickets.com:80/
Physical Path
Logon Method	Not yet determined
Logon User	Not yet determined

Config Source

   45: 	</connectionStrings>
   46: 	<system.web.extensions>
   47: 		<scripting>

My web.config:

<?xml version="1.0"?>
<configuration>
   <connectionStrings>
   </connectionStrings>
   <system.web.extensions>
       <scripting>
           <webServices>
               
               <authenticationService enabled="true" requireSSL="false"/>
           </webServices>
       </scripting>
   </system.web.extensions>
   <system.web>
       <httpHandlers>
           <add path="ChartImg.axd" verb="GET,HEAD" type="System.Web.UI.DataVisualization.Charting.ChartHttpHandler, System.Web.DataVisualization, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" validate="false"/>
       </httpHandlers>
       <compilation debug="true" strict="false" explicit="true" targetFramework="4.0">
           <assemblies>
               <add assembly="System.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
               <add assembly="System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
               <add assembly="System.Web.Extensions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
               <add assembly="System.Web.Extensions.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/></assemblies></compilation>
       <pages controlRenderingCompatibilityVersion="3.5" clientIDMode="AutoID">
           <namespaces>
               <clear/>
               <add namespace="System"/>
               <add namespace="System.Collections"/>
               <add namespace="System.Collections.Specialized"/>
               <add namespace="System.Configuration"/>
               <add namespace="System.Text"/>
               <add namespace="System.Text.RegularExpressions"/>
               <add namespace="System.Web"/>
               <add namespace="System.Web.Caching"/>
               <add namespace="System.Web.SessionState"/>
               <add namespace="System.Web.Security"/>
               <add namespace="System.Web.Profile"/>
               <add namespace="System.Web.UI"/>
               <add namespace="System.Web.UI.WebControls"/>
               <add namespace="System.Web.UI.WebControls.WebParts"/>
               <add namespace="System.Web.UI.HtmlControls"/>
           </namespaces>
           <controls>
               <add tagPrefix="asp" namespace="System.Web.UI.DataVisualization.Charting" assembly="System.Web.DataVisualization, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
           </controls>
       </pages>
       <sessionState mode="InProc" timeout="60"/>
       <authentication mode="Forms">
           <forms name=".MyCookie" slidingExpiration="true" timeout="60" cookieless="AutoDetect" loginUrl="/login/" protection="All" defaultUrl="/">
               <credentials passwordFormat="SHA1"/>
           </forms>
       </authentication>
       <customErrors mode="Off" defaultRedirect="/contact.aspx">
           <error statusCode="404" redirect="/contact.aspx"/>
       </customErrors>
       <roleManager domain="192.168.0.103" enabled="true" cacheRolesInCookie="true" cookieName=".ASPXROLES" cookieTimeout="60" cookiePath="/" cookieRequireSSL="false" cookieSlidingExpiration="true" cookieProtection="All" defaultProvider="AccessRoleProvider" createPersistentCookie="false" maxCachedResults="25">
           <providers>
               <clear/>
               <add name="AccessRoleProvider" connectionStringName="conn1" applicationName="/tickets" type="Samples.AccessProviders.AccessRoleProvider"/>
           </providers>
       </roleManager>
       <membership defaultProvider="AccessMembershipProvider" userIsOnlineTimeWindow="30">
           <providers>
               <clear/>
               <add name="AccessMembershipProvider" type="Samples.AccessProviders.AccessMembershipProvider" connectionStringName="conn1" requiresQuestionAndAnswer="false" applicationName="/tickets" minRequiredPasswordLength="6" enablePasswordRetrieval="false" enablePasswordReset="true" requiresUniqueEmail="true" minRequiredNonalphanumericCharacters="0" passwordFormat="Hashed"/>
           </providers>
       </membership>
   </system.web>

   <system.webServer>
       <validation validateIntegratedModeConfiguration="false"/>
       <modules runAllManagedModulesForAllRequests="true">
       </modules>
       <handlers>
           <add name="ChartImageHandler" preCondition="integratedMode" verb="GET,HEAD" path="ChartImg.axd" type="System.Web.UI.DataVisualization.Charting.ChartHttpHandler, System.Web.DataVisualization, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
       </handlers>
       <rewrite>
           <rules>
               <rule name="ordermanagement">
                   <match url="^eventmanager/ordermanagement/([0-9]+)"/>
                   <action type="Rewrite" url="ordermanagement.aspx?eventid={R:1}"/>
               </rule>
           </rules>
       </rewrite>
   </system.webServer>
</configuration>

I then checked out this page: http://mvolo.com/blogs/serverside/archive/2007/12/08/IIS-7.0-Breaking-Changes-ASP.NET-2.0-applications-Integrated-mode.aspx

And now Im trying this:
%windir%\system32\inetsrv\Appcmd migrate config "c:\inetpub\tickets"

But I get the error:
ERROR ( message:Cannot find APP object with identifier "c:\inetpub\tickets"". )
I also tried:
%windir%\system32\inetsrv\Appcmd migrate config "tickets"

But still no luck..
What am I doing wrong?

04-16-2010, 6:48 AM In reply to

petervdkerk
Joined on 02-01-2008, 4:34 PM
Posts 25

Re: The configuration section 'system.web.extensions' cannot be read because it is missing a section declaration

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I have now done this:
"appcmd list sites"

I then see this:
SITE "Tickets" (id:1,bindings:http/*:80:www.tickets.com,state:Started)

Next I do:
appcmd migrate config "Tickets"

I then get:
ERROR ( message:Cannot find APP object with identifier "Tickets". )

What am I doing wrong?

04-21-2010, 10:30 PM In reply to

Leo Tang - MSFT
Joined on 12-12-2008, 2:47 AM
Posts 4,018

Re: The configuration section 'system.web.extensions' cannot be read because it is missing a section declaration

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Hi,

This issue not caused by the web.config migration. If you update you application to .Net Framework4.0, but assign this application to an application pool running under .Net Framework3.5 or previous version, you will encounter this error.

You can assign this application to an .Net Framework4.0 application pool in IIS to fix issue. If you have any problem, please update here.

Please mark the replies as answers if they help or unmark if not.
If you have any feedback about my replies, please contact msdnmg@microsoft.com.
Microsoft One Code Framework

05-05-2010, 9:19 AM In reply to

mdrussell0779
Joined on 05-04-2010, 9:29 PM
Posts 9

Re: The configuration section 'system.web.extensions' cannot be read because it is missing a section declaration

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Leo Tang - MSFT:
Hi,

This issue not caused by the web.config migration. If you update you application to .Net Framework4.0, but assign this application to an application pool running under .Net Framework3.5 or previous version, you will encounter this error.

You can assign this application to an .Net Framework4.0 application pool in IIS to fix issue. If you have any problem, please update here.

I'm getting this error too, but my app is already running on a 4.0 application pool.

Help?

05-06-2010, 3:01 AM In reply to

Leo Tang - MSFT
Joined on 12-12-2008, 2:47 AM
Posts 4,018

Re: The configuration section 'system.web.extensions' cannot be read because it is missing a section declaration

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Hi,

Could you please post your web.config here?

Thanks.

Please mark the replies as answers if they help or unmark if not.
If you have any feedback about my replies, please contact msdnmg@microsoft.com.
Microsoft One Code Framework

05-06-2010, 7:26 AM In reply to

mdrussell0779
Joined on 05-04-2010, 9:29 PM
Posts 9

Re: The configuration section 'system.web.extensions' cannot be read because it is missing a section declaration

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Leo Tang - MSFT:
Hi,

Could you please post your web.config here?

Thanks.

It's erroring at:

<system.web.extensions>
       <scripting>
           <scriptResourceHandler enableCompression="true" enableCaching="true"/>
       </scripting>
    </system.web.extensions>

Here's the web.config contents,

<?xml version="1.0"?>
<configuration>
    <appSettings>
    </appSettings>
    <connectionStrings>
    </connectionStrings>
    <system.web>
       <httpRuntime maxRequestLength="8192"/>
       <globalization culture="en-US"/>
       <pages styleSheetTheme="Professional" enableEventValidation="false" controlRenderingCompatibilityVersion="3.5" clientIDMode="AutoID">
           <controls>
               <add tagPrefix="ajaxToolkit" namespace="AjaxControlToolkit" assembly="AjaxControlToolkit"/>
               <add tagPrefix="widget" src="~/_widgets/select_user.ascx" tagName="select_user"/>
               <add tagPrefix="BDP" namespace="BasicFrame.WebControls" assembly="BasicFrame.WebControls.BasicDatePicker"/>
           </controls>
       </pages>
       <compilation debug="true" targetFramework="4.0">
           <assemblies>
               <add assembly="CrystalDecisions.CrystalReports.Engine, Version=12.0.2000.0, Culture=neutral, PublicKeyToken=692FBEA5521E1304"/>
               <add assembly="CrystalDecisions.ReportSource, Version=12.0.2000.0, Culture=neutral, PublicKeyToken=692FBEA5521E1304"/>
               <add assembly="CrystalDecisions.Shared, Version=12.0.2000.0, Culture=neutral, PublicKeyToken=692FBEA5521E1304"/>
               <add assembly="CrystalDecisions.Web, Version=12.0.2000.0, Culture=neutral, PublicKeyToken=692FBEA5521E1304"/>
            </assemblies>
       </compilation>
       <authorization>
           <deny users="?"/>
           <allow users="*"/>
       </authorization>
    </system.web>
    <system.web.extensions>
       <scripting>
           <scriptResourceHandler enableCompression="true" enableCaching="true"/>
       </scripting>
    </system.web.extensions>
</configuration>

05-07-2010, 3:52 AM In reply to

Leo Tang - MSFT
Joined on 12-12-2008, 2:47 AM
Posts 4,018

Re: The configuration section 'system.web.extensions' cannot be read because it is missing a section declaration

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Hi,

Please check the machine.config file located in C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Config directory. Does the following configuration section declaration exists?

</configProtectedData>

</configuration>

Note: if you intend to manually edit the machine.config file, please remember to backup it firstly.

Please mark the replies as answers if they help or unmark if not.
If you have any feedback about my replies, please contact msdnmg@microsoft.com.
Microsoft One Code Framework

05-07-2010, 7:24 AM In reply to

mdrussell0779
Joined on 05-04-2010, 9:29 PM
Posts 9

Re: The configuration section 'system.web.extensions' cannot be read because it is missing a section declaration

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-- double post, oops, see below --

05-07-2010, 7:25 AM In reply to

mdrussell0779
Joined on 05-04-2010, 9:29 PM
Posts 9

Re: The configuration section 'system.web.extensions' cannot be read because it is missing a section declaration

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Leo,

Yeah there's a section for that:

05-11-2010, 7:45 PM In reply to

Bruce L
Joined on 02-08-2007, 6:53 PM
Posts 3

Re: The configuration section 'system.web.extensions' cannot be read because it is missing a section declaration

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I am seeing the same problem with one of our IIS 7.0 machine. I am posting a little bit of extra information we found out

1) I am getting the same error when I tried to open any section, eg. asp.net Machine Key, IIS default document.

2) I did a filemon trace and found that IIS manager and the worker process was somehow reading the version 2.0 machine.config even though the worker process is set to 4.0. I did the same filemon trace on another machine and it is reading the 4.0 machine.config.

I think there's something in the registry that tells IIS which config to read.. but I couldn't figure it out.

Bruce

05-11-2010, 7:50 PM In reply to

mdrussell0779
Joined on 05-04-2010, 9:29 PM
Posts 9

Re: The configuration section 'system.web.extensions' cannot be read because it is missing a section declaration

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Yeah I'm still having this problem. Section is commented out till a resolution can be found :(

05-11-2010, 8:27 PM In reply to

Leo Tang - MSFT
Joined on 12-12-2008, 2:47 AM
Posts 4,018

Re: The configuration section 'system.web.extensions' cannot be read because it is missing a section declaration

Reply Contact

Hi,

Could you please send the applicationHost.config file located in C:\Windows\system32\inetsrv\config to me at: liangliang(dot)tang(at)hotmail(dot)com?

I'll try reproduce this issue. Thanks.

Please mark the replies as answers if they help or unmark if not.
If you have any feedback about my replies, please contact msdnmg@microsoft.com.
Microsoft One Code Framework

05-18-2010, 11:28 AM In reply to

doorway27
Joined on 08-27-2006, 2:59 PM
Posts 1

Re: The configuration section 'system.web.extensions' cannot be read because it is missing a section declaration

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anyone find a fix to this yet? I am having the same problem and need to get a site up and running

Tags: mvc2 asp.net.net 4

05-18-2010, 1:36 PM In reply to

CarlosAg
Joined on 02-19-2003, 2:23 AM
Posts 740

Re: The configuration section 'system.web.extensions' cannot be read because it is missing a section declaration

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Do you by any chance have nested applications that are in 2.0, for example the "/" application is .net 4.0 and then /App is 2.0?

Anyway, you should be able to prevent the problem by adding the declaration of the sections at the top of your web.config:

So just add right after the <configuration>:

05-19-2010, 6:56 PM In reply to

mdrussell0779
Joined on 05-04-2010, 9:29 PM
Posts 9

Re: The configuration section 'system.web.extensions' cannot be read because it is missing a section declaration

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I didn't have a nested app, but this still fixed the problem for me. I put this stuff back at the top (it was removed going from 3.5 > 4.0 automatically), and then uncommented my compression/caching tags, and all is well.

Mitch

07-26-2010, 12:07 PM In reply to

Erik_with_a_K
Joined on 09-26-2007, 10:37 PM
Posts 1

Re: The configuration section 'system.web.extensions' cannot be read because it is missing a section declaration

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CarlosAg,

Thanks for your post. I do have a 2.0 app nested within a 4.0 app and I'm getting the subject error. I've been googling a solution and stumbled upon your post.

All pages in the asp.net 4 app work fine. As soon as I nav to a page within the 2.0 app (which is just a subfolder in the root app), I get the error. I have configured IIS7.5 for each app. The 2.0 folder was converted to an app and it runs in a 2.0 app pool. The 4.0 app is the root app and it is set to run in a 4.0 app pool.

It appears that my 4.0 app is trying to propogate its settings down to the 2.0 sub app. Note that my error message refers to the 4.0 web.config of the root app, even though I am trying to browse a page in the sub app.

Any ideas how to keep these 4.0 settings from propogating to nested app?

Regards,
-e

11-04-2010, 10:04 AM In reply to

kipusoep
Joined on 03-23-2009, 11:49 AM
The Netherlands
Posts 15

Re: The configuration section 'system.web.extensions' cannot be read because it is missing a section declaration

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I'm getting this error too on our test server, which is Windows Server Web 2008 SP1 (32 bit).

Our production servers, which are Windows Server 2008 64 bit, running exactly the same webapp, are doing fine...

And yes, the app pool runs on 4.0

Please fix this bug!

Greets, kipusoep

11-11-2010, 8:55 PM In reply to

felixz
Joined on 11-12-2010, 1:29 AM
Posts 21

Re: The configuration section 'system.web.extensions' cannot be read because it is missing a section declaration

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I also meet a problem like this

HTTP Error 500.19 - Internal Server Error

Config Error	The configuration section 'standardEndpoints' cannot be read because it is missing a section declaration

and I set the applicationPool to .net framework 4

11-11-2010, 11:58 PM In reply to

CarlosAg
Joined on 02-19-2003, 2:23 AM
Posts 740

Re: The configuration section 'system.web.extensions' cannot be read because it is missing a section declaration

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This is a common problem caused by the web.config included in applications developed for .net 3.5. If you want to run it in .NET 4.0, you will need to clean up the web.config to remove all of that duplicated sections that unfortunately were required for 3.5. Alternatively you could just change the application pool to run in .net 2.0 which is what it seems these applications were developed on anyway.

03-07-2011, 11:55 AM In reply to

Sebastian.Castaldi
Joined on 03-07-2011, 4:43 PM
Posts 3

Re: The configuration section 'system.web.extensions' cannot be read because it is missing a section declaration

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For some reason by adding system.web.extensions to the Web.config, overrides the system.web.extensions group (by default in the machine.config). The solution is:

1. Delete the System.Web.Extensions from your web.config if you don't need it. (it will use the default values from the machine.config)

2. Add <sectionGroup name="system.web.extensions" from the machine.config into the Web.config section group

Thanks,

Sebastian

08-26-2011, 7:12 AM In reply to

onder7973
Joined on 01-26-2011, 8:59 AM
Posts 7

Re: The configuration section 'system.web.extensions' cannot be read because it is missing a section declaration

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I've experienced this error when running 32bit website applications in 64bit environment. There are several ways to overcome this issue:
- recompile your website with AnyCPU or 64bit mode
- change the website application pool to support 32bit apps - this can be done by selecting an app pool in IIS manager and in then changing the Advanced Settings > Enable 32-bit applications to true

11-02-2011, 8:39 PM In reply to

Chiramisu
Joined on 07-20-2011, 6:31 PM
Posts 1

Re: The configuration section 'system.web.extensions' cannot be read because it is missing a section declaration

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While your solution didn't work for me, it got me on the right track so thank you.

What I had was a <component> section with some VBScript in it and I was getting this error. I haven't tried actually running my code yet, but at least my page renders again, with this code inserted immediately after the <configuration> tag.

<configSections>
<section name="component" type="component"/>
</configSections>

To be honest, I have no idea whether this is even valid or correct, but like I said, my page renders again, so I guess we'll see when I go to run my scripts. Assume that if I don't postback (ack, nerd humor, lol) that it worked for me.

Cheers ;)

p.s. WTH is up with the redonculous post text editor and syntax on this site?! ACK!! Seriously I have to put <br /> after every line just to get line separation? Get a clue, whoever designed the WYSIWYG editor. Rawr!!

05-03-2012, 10:16 AM In reply to

Lars101
Joined on 11-06-2009, 5:33 AM
Posts 2

Re: The configuration section 'system.web.extensions' cannot be read because it is missing a section declaration

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Adding the section groups at the top solved this issue for us.

Cheers

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