Enable Failed Request Tracing in IIS

The following steps are applicable on Windows Server 2012R2

Open the Server Manager Choose Add Roles and Features from the Manage menu.
Select the Installation Type and then click Next.
Select the destination server and then click Next.
On the Select server role page, expand the Web Server (IIS) role, expand Web Server and expand Health and Diagnostics Then select Tracing and click Next.
On the page Select features, click Next.
On the page Confirm installation selections, click Install.
On the Results page, click Close.