New answers tagged .net
This is usually because you have a custom application on top of IIS. If it is an in house built application, speak with the Developers about it. If it is not developed in house, please have a look at .net CLR with counters https://msdn.microsoft.com/en-us/library/x2tyfybc(v=vs.110).aspx and more tips on CLR performance ...
To log custom headers you can use IIS Advanced Logging feature. A good article on it can be found at http://www.iis.net/learn/extensions/advanced-logging-module/advanced-logging-for-iis-custom-logging
On Windows Server 2012/R2, you don't have to download the 3.5 version of the .NET Framework; instead, you'll have to install it as a Windows feature, from Server Manager. If the Server Manager complains about not being able to find the installation sources, you'll need to add the Windows installation DVD (or ISO) as an installation source.
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