CherryPy Hello World error

Question

When I am running CherryPy Hello World:

import cherrypy

class HelloWorld:
    def index(self):
        return \"Hello world!\"
    index.exposed = True

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Answer 1

I ran into this problem yesterday on an Ubuntu Linux server. I spent a couple of hours trying to track down the bug in the CherryPy code before I realized that the error message is very generic. It will give this error message even if the host doesn't own the IP address to which the server is attempting to bind. In my case, the loopback interface (lo, 127.0.0.1) was disabled. Thus, even if I set server.socket_host='0.0.0.0', the attempt to check the port, wait_for_occupied_port, would fail (as it assumes, reasonably, that the loopback interface is always available). After re-enabling the loopback interface, the CherryPy server would start up normally.

Update: CherryPy 3.2.3 has a fix for this particular issue. Until 3.2.3 is released, development builds are available on the CherryPy project downloads.