Are you running the developer edition of CFMX? If so, you may know that beyond running code yourself (as localhost or 127.0.0.1) you can also let up to one other IP address connect to the server. This is great for showing the results of some development to a client, etc.
But you can't just expect that IP address to be "removed" when the server is restarted. It's stored in a file and will remain there seemingly locking you in to only allowing that one IP address to visit your site.
The trick is just knowing where to change the value. In your [cfusionmx]/lib/license.properties file, delete the line:
Then restart the server.