I tried adding custom values to below AEM config under /apps/*/config
And whenever I restart my instance, I get Resource at '/' not found: No resource found and also when I logout from home screen, same error.
Also, when I go to http://localhost:4502/crx/de/index.jsp# and login from CRX, I am back in session.
Any help appreciated.
If you get that message it seems that you broke/misconfigured the authentication system.
Please provide the details of properties that are modified as part of the mentioned configs. (Sling Authenticator and Sling Servlet resolver) and reason for the same/functionality you are trying to achieve.