Website showing blank page after deploying to production–ASP.NET Webforms

Recently after deploying our ASP.NET 4.0 website to our production server we notice a weird behavior. As soon as we visit the site, it was displaying a blank page instead of our home login page.

There was not html returned but the status for the request was 200 OK. None of our logging mechanism was working.

After looking around, accidently we noticed that while changing some setting in web.conifg on production, the file got corrupted. After correcting those errors the site was back up.

Hope this helps if you are in similar situation.