Internet Explorer 11 not detected correctly by .NET 4.0 framework. "do_postback" error appears.
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.
- Postbacks fail on the site, and the browser version is returned as zero (0).
- 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.
- Download http://documentation.ektron.com/IE11.zip.
- Extract the .zip file to your website's siteroot\App_Browsers folder.