Detecting cyclic redirections automatically

I've found cyclic redirections in my web application, but I'm not able to reproduce this behaviour for a while. The worst thing is that it happens on automatic login via third-party web site. So the visitor can't open the home page and he is not able to inform me about the problem via contact form. I even don't know how many users can't reach my web site.

The cycle looks like this: third party site -> auto login page -> home page -> third party site

Is there any automatic or semi automatic tools to detect cyclic redirections by the web server logs?