Mac OS X: Computer doesn‘t "network" with itself in Classic ("Loopback address")

In the Mac OS X Classic environment, if you can't "network" with your own computer using some addresses, use the Mac's assigned IP address or host name. This document applies to Classic applications using a sharing service, such as Web Sharing.
For example, you can't connect to services in the Classic environment that use IP address 127.0.0.1, or "localhost" as the server address or host name. (Experienced users call these "loopback addresses," but they can also be thought of as meaning "this computer.")

What do I do?

Just open Network preferences and look at your Mac's assigned IP address or its host name. Use that instead of 127.0.0.1 or "localhost".
Published Date: Feb 17, 2012