We're having a weird issue with one of our web apps that we're trying to capture as an alert.
The TL;DR version is that randomly the app bugs out and throws a generic "error has occurred" page when people try to login. It's not kind enough to crash the app pool, throw event log messages, etc so we're using a web form login monitor to try and catch it.
I have the monitor setup and it tests successfully when the app is working.
However, last time the app fell over the form login monitor didn't appear to trip. I think that's because when the issue occurs, rather than the user getting an error on the login page, they get redirected to a generic error page.
Is there a way to get the form login monitor to catch that, or is there a way to get it to say "if I don't see the success string, fail"?