Troubleshooting Identity Server 4

your problem can be anything. enable logging to the console and you can find out what it is. Identity Server 4 by default uses the asp.net core logger provider to do its internal logging.

in your Startup.cs within the Configure(IApplicationBuilder app, ILoggerFactory loggerFactory) method. Add Console logging by loggerFactory.AddConsole(LogLevel.Trace); and make sure that you include the logger extension package in your project.json "Microsoft.Extensions.Logging.Console": "1.0.0",.