I seemed to have locked myself out of remote admin via a browser. I entered the wrong IP address in the Permitted IPs section via the browser admin (Configuration > Admin > Permitted IPs). The wrong IP is also a public IP in my assigned block of IP addresses. It was a copy/paste mistake on my part. D'OH!
I can still can connect via VPN and Remote Desktop to servers. Is there anything else I can do besides drive to the datacenter and connect via the console port?