It could be STS if you configured it in your web server but that doesn't seem to be the case. Chrome has this "feature", if it tries to reach your domain on port 80 and it can't, it tries to reach it on port 443... just in case 
It could be STS if you configured it in your web server but that doesn't seem to be the case. Chrome has this "feature", if it tries to reach your domain on port 80 and it can't, it tries to reach it on port 443... just in case