Internet Explorer 11 not detected correctly by .NET 4.0 framework

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 Internet Explorer 11 not detected correctly by .NET 4.0 framework.  "do_postback" error appears.

Summary

Internet Explorer 11 may not be detected correctly by .NET 4.0 framework if custom .browser files are used. This article describes the source of the problem and provides a workaround.

Symptoms

  • Postbacks fail on the site, and the browser version is returned as zero (0).

Causes

  • If any .browser files exist in your site's App_Browsers folder, the browser version detected on the server is wrong, namely Mozilla 0.0.

Solutions

  1. Download http://documentation.ektron.com/IE11.zip.
  2. Extract the .zip file to your website's siteroot\App_Browsers folder.

More Resources

http://connect.microsoft.com/VisualStudio/feedback/details/806542/fix-internet-explorer-11-not-detected-correctly-by-net-4-0-framework-when-custom-browser-files-are-used