Invalid http_host header
The error log is straightforward. As it suggested,You need to add 198.211.99.20 to your ALLOWED_HOSTS setting.
In your project settings.py file,set ALLOWED_HOSTS like this :
ALLOWED_HOSTS = ['198.211.99.20', 'localhost', '127.0.0.1']
For further reading read from here.
In your project settings.py file,set ALLOWED_HOSTS like this :
ALLOWED_HOSTS = ['62.63.141.41', 'namjoosadr.com']
and then restart your apache. in ubuntu:
/etc/init.d/apache2 restart