Hi ,
Have you checked event viewer .
Or try below steps.
Open Internet Information Services (IIS) Manager:
2.In the Connections pane, select the server connection, site, application, or directory for which you want to configure failed request tracing.
3.In the Actions pane, click Failed Request Tracing...
4.In the Edit Web Site Failed Request Tracing Settings dialog box, select the Enable check box to enable tracing, leave the default value or type a new directory where you want to store failed request log files in the Directory box, type the number of failed
request trace files you want to store in the Maximum number of trace files box, and then click OK.
Rajat Jaiswal