Or, it’s not IdentityServer, it’s you.
A common issue with when integrating with an OpenID Provider, such as IdentityServer4, is getting caught in an infinite redirect loop. Typically, this redirect loop will eventually crash your browser tab, or the browser itself.
In Chrome, you’d get the
ERR_TOO_MANY_REDIRECTS error message. Or, if you’re issuing cookies to track nonce and states values with each redirect and not cleaning up after yourself (I’m looking at you OWIN/Katana), then you’ll probably get an a 400 Bad Request, with a message of something like “The size of the request headers is too long”.