My apologies to have missed this post. Let me explain how our add monitor for website works.
When adding a monitor, Site24x7 expects a valid response from the site that is going to be monitored. i.e. When adding the website we expect 200 as the response. Otherwise we say it as configuration error. This is because we don't want to monitor a website that is already down or problematic and trigger our notification mechanism unnecessarily. Hence we have this as a restriction our end and the reason for getting “configuration error”.
Other times you’ll not get this error.
If you aren’t having such a problem, it would be great if can explain your use case a little more elaborately so that we could help you accordingly.
Product Manager, Site24x7