For my website when using Firefox or Chrome you get the following message: Sorry, 10.0.11.38 has been banned. For Internet Explorer you 403 forbidden error.
Note: 10.0.11.38 is the internal IP of the load balancer which has the domains certificate and associated public IP address.
I went to admin/user/rules and noticed that this ip of 10.0.11.38 has been listed as a host to deny access so I deleted this rule and the drupal website displays again.
We did not enter this ip as a rule originally so I suspect that drupal somehow decided to add this ip as a denied host.
How would I prevent this from happening again?