tcp.invited_nodes list prevents the 11g Listener from starting

Hi all,
I'm trying to setup an 11g environment on my Windows XP desktop, to prototype moving our main development system from 10.2.0.4 up to 11.2.0.3

I have installed Oracle, created an instance, and built my schema, with only a few small changes to our existing scripts.

However, I can't get the Listener to start with valid node checking configured.

In sqlnet.ora, I have:

tcp.validnode_checking = yes
tcp.invited_nodes = {server.ip.add.ress}

this allows the listener to start.

In fact, any single entry here allows the listener to start, including invalid node names e.g.
tcp.invited_nodes = {localhost}