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  • Avatar3posts24karma

    Umbraco 4.5 - Dontnetpanel Server Error system.web.extensions

    William L started this topic June 25, 2010 @ 06:27

    I have 4.5 running localhost fine. When I try to install to my host Dontnetpanel gives me an error:

    Line number: 154
    Error: The configuration section 'system.web.extensions' cannot be read because it is missing a section declaration

    If i remove from web.config

    <!-- ASPNETAJAX -->
          <scriptResourceHandler enableCompression="true" enableCaching="true" />

    I can get to the umbraco install screen.



  • Avatar2245posts3445karma
    Comment with ID: 36794
    Rich Green posted this reply June 25, 2010 @ 08:37

    Looks like your site on your host is not running under .NET 4.

    You need to either change it so it is, or I believe there's a version of Umbraco 4.5 that runs under .NET 3.5 (I'm not 100% on this).

    Best of luck


  • William L posted this reply June 25, 2010 @ 06:21

    Thanks Rich,

    For anyone else having this problem with Softsys this is the reply I got from support.

    "It apears that this config section would already be declared on the server level or may be something is messing up. I've commented it out for now and you can go ahead with your installation."

    It seems to be working with the section commented but I don't know if there will be any side effects.


  • Avatar64posts123karma
    Comment with ID: 36849
    Ulrich Wagner Gade Ebsen posted this reply June 25, 2010 @ 06:39


    DotNetPanel has become opensource under the name WebSitePanel (www.websitepanel.net) - tell your host to upgrade as there won't be any further updates to DotNetpanel.


  • Avatar58posts88karma
    Comment with ID: 36855
    Thomas Kjær Nielsen posted this reply June 25, 2010 @ 08:31


    I had the same problem, and it also got fixed by commenting the AJAX stuff out.

    But now I get error about the .NET Framework. Gonna read a bit about that part.


  • Dan Thayer posted this reply June 25, 2010 @ 08:51

    Umbraco 4.1 RC only ran under .NET Framework 4.0 but Umbraco 4.5 was supposed to work under .NET Framework 3.5 OR 4.0.  I tried installing today under .NET 3.5 and ran into the same error.  Switching to .NET 4.0 fixes that error.


  • Avatar73posts52karma
    Comment with ID: 36889
    Anders Dahl Tollestrup posted this reply June 26, 2010 @ 11:09


    As posted, the DotNetPanel doesn't support .NET 4.0 and my hoster SeekDotNet has to enable .NET 4.0 framework manually for each site.


  • Avatar466posts729karma
    Comment with ID: 39720
    Paul Blair posted this reply July 19, 2010 @ 12:39

    I was having the same issue with SoftSys and Williams post sorted out the issue for me.

  • Avatar64posts123karma
    Comment with ID: 39721
    Ulrich Wagner Gade Ebsen posted this reply July 19, 2010 @ 12:47

    Anders, DotNetPanel (now WebSitePanel) indeed supports .NET 4.0!

    If your hosting provider has trouble with it I can provide hosting with full support for .NET 4.0/umbraco 4.5 and with WebSitePanel (former DotNetPanel) and its very fair priced... ;)

    Ulrich Wagner Gade Ebsen


  • Avatar436posts203karma
    Comment with ID: 39722
    Simon Justesen posted this reply July 19, 2010 @ 01:01

    If you want, you can find the umbraco 4.5 for .net 3.5 here: http://nightly.umbraco.org/ (may not be production stable, haven't experienced problems though)

  • Avatar255posts280karma
    Comment with ID: 41112
    Kevon K. Hayes posted this reply July 30, 2010 @ 05:09

    I was able to solve my issue by enabling Allowing .NET 4.0.3 under ISAPI Restrictions:


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