Diagnosing 500 Internal Server Errors from IIS

by Frank Fu

Windows 10 Setup

In short, setup failed request tracing feature on IIS

On Windows 10, let's first enable it

  1. netmgr > server > website > failed request tracing rules >
  2. edit site tracing > enable
  3. add > all content > status codes > 500

Then to view the logs

inetmgr > server > website > failed request tracing rules > view trace logs then find the fr*.xml related files, right click and open with IE Internet Explorer. Not sure why this doesn't open in a parsed format with Edge or any other browser.

Azure Setup

On Azure it is

azure portal > app service > myapp > diagnostic logs> failed request tracing > on

Then to view the logs

azure portal > app service > myapp > advanced tools > go to kudu scm panel > debug console > cmd > log files > W3SVC3XXXX then open with IE Internet Explorer.

Source

https://blogs.msdn.microsoft.com/benjaminperkins/2017/01/27/enable-failed-reuqest-tracing-for-an-azure-app-service-web-app/
https://blogs.msdn.microsoft.com/benjaminperkins/2016/06/15/lab-4-install-and-configure-failed-request-tracing/