Not sure what I did to bring this on, but now if I try to log into the Admin page I receive the following error message with my IP shown: 
System Message: You are not allowed to login to admin area from xx.xxx.xx.xxx address (403) 
I've beaten myself up for a couple of days, and I've tried whitelisting the IP everywhere I can think of (in WHM, cPanel, etc) to no avail. I've also tried changing my password in the database (php hash). I've also run countless google searches. Any suggestions? 
FWIW I can log into the client area just fine. 
TIA.