Force IE 11 "User agent string" using tags

I also faced the same problem in my 2003 windows server with .net framework 4.0 and after a long research i found the below is helpful...

I created App_Browsers folder and put a browser file named as ie.browser and pasted the below browser definition text and it started working

<browsers>
<browser id="IE11" parentID="Mozilla">
<identification>
  <userAgent match="Trident\/7.0; rv:(?'version'(?'major'\d+)(\.(?'minor'\d+)?)(?'letters'\w*))(?'extra'[^)]*)" />
  <userAgent nonMatch="IEMobile" />
</identification>
<capture>
  <userAgent match="Trident/(?'layoutVersion'\d+)" />
</capture>
<capabilities>
  <capability name="browser"              value="IE" />
  <capability name="layoutEngine"         value="Trident" />
  <capability name="layoutEngineVersion"  value="${layoutVersion}" />
  <capability name="extra"                value="${extra}" />
  <capability name="isColor"              value="true" />
  <capability name="letters"              value="${letters}" />
  <capability name="majorversion"         value="${major}" />
  <capability name="minorversion"         value="${minor}" />
  <capability name="screenBitDepth"       value="8" />
  <capability name="type"                 value="IE${major}" />
  <capability name="version"              value="${version}" />
</capabilities>
 </browser>

<!-- Mozilla/5.0 (Windows NT 6.3; Trident/7.0; rv:11,0) like Gecko -->
<browser id="IE110" parentID="IE11">
<identification>
  <capability name="majorversion" match="11" />
</identification>

<capabilities>
  <capability name="ecmascriptversion"    value="3.0" />
  <capability name="jscriptversion"       value="5.6" />
  <capability name="javascript"           value="true" />
  <capability name="javascriptversion"    value="1.5" />
  <capability name="msdomversion"         value="${majorversion}.${minorversion}" />
  <capability name="w3cdomversion"        value="1.0" />
  <capability name="ExchangeOmaSupported" value="true" />
  <capability name="activexcontrols"      value="true" />
  <capability name="backgroundsounds"     value="true" />
  <capability name="cookies"              value="true" />
  <capability name="frames"               value="true" />
  <capability name="javaapplets"          value="true" />
  <capability name="supportsCallback"     value="true" />
  <capability name="supportsFileUpload"   value="true" />
  <capability name="supportsMultilineTextBoxDisplay" value="true" />
  <capability name="supportsMaintainScrollPositionOnPostback" value="true" />
  <capability name="supportsVCard"        value="true" />
  <capability name="supportsXmlHttp"      value="true" />
  <capability name="tables"               value="true" />
  <capability name="supportsAccessKeyAttribute"    value="true" />
  <capability name="tagwriter"            value="System.Web.UI.HtmlTextWriter" />
  <capability name="vbscript"             value="true" />
</capabilities>
  </browser>
</browsers>

Solved! Website is up just installing Dotnet framework 4.5 on server

Actually I didn't find a way to force programmatically browsers User agent string (this was the original question). But repaired website with 0 code..

Just made lot of tests and on one server I found out that website was working, on other server it wasn't.

The "good server" was a Win2012, and "bad servers" were Win2008. On Win2012 Aspnet 4.5 was running, and on Win2008 it wasn't.

I installed dotnet framework 4.5 on bad servers too, and everything started working!

If you don't want to install the entire .NET Framework 4.5, you can just update the .NET Framework 4.0 with this fix from Microsoft http://www.microsoft.com/en-us/download/confirmation.aspx?id=39257 In my case this worked perfectly.

Force IE 11 "User agent string" using tags

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