Instant Web Publishing cannot be started - 11.0V3 on Mac OS X 10.6.7
The host Mac has a dynamically assigned IP address. The firewall is turned off (for the moment). When Apple's Web sharing is off, IWP takes a few seconds to respond with the error IWP cannot be started. When Web sharing is on, the port conflict prompts a dialogue to select a different port and after inputting 591, the same error is returned again after a few seconds.
Apache seems to be running fine; my local site loads locally and from other nodes on the local network.
This is a recent installation of 11.0V3, perhaps just one month, and therefore was not patched.
Thanks in advance for any assistance or suggestions.