Here's how you can run All in One Security WP & Firewall on your WP Dashboard while managing the WP site via InfiniteWP without getting the 302 Error.
1.) On the WordPress dashboard:
WP Security > User Login > Force Logout
Enable Force WP User Logout: Not checked, because it logs out InfiniteWP user
2.) On the Infinite WP Dashboard > Site Details > Advanced
Content Type: text/plain
Connect Using : Site URL
Voilà!