If you get blacklisted/locked out despite of having your IP whitelisted with Shield, please ensure the IP address source under Dashboard => Plugin Defaults is correct. 


You can use the Welcome Wizard to set that up: Dashboard => Wizards => Getting Started Setup Wizard.


If this doesn't help, please use Audit Trail Viewer to review your site activities:

https://icontrolwp.freshdesk.com/support/solutions/articles/3000070244


It will tell you exactly what's going on, what's being blocked....so you could get the problem resolved.


Note: In case you get locked out of your site, follow the guide outlined in the article here.