Ntp refuses to sync with error "Can't assign requested address"

I'm attempting to use ntp to sync to several different time servers, including hte apple server and those in the ntp.org server pool. In all cases, I cannot sync correctly, with many system log and consol error messages of the form:
ntpd[5123]: sendto(xxx.xxx.xxx.xxx): Can't assign requested address
I checked that the firewall is allowed UDP connections on port 123. Some googling hinted that hte problem may be changing IP address of my laptop when i sleep it and wake with a different IP, so I manually restarted it, and everything was fine.
Anyone know how to reliably start/restart ntp when I wake from sleep?
cheers

It looks like Java is consuming all client-side TCP
ports. When the error occurs, I also start to have
problems connecting from my browser to any Web-page.I would take this as an indication, that the problem is on the server side and the web server might keep some resources after the client disconnects from the socket. You could verify that if you run your test program from another computer after the error occurs. If that program is again able to open connections, then this might indicate that the problem is in fact on the client side. However if also access from another machine is blocked, then I would guess it is a server side problem.
Am I having to wait for the garbage collector to free
the ports, or is this an OS X problem?Garbage collection is not an issue here.

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Ntp refuses to sync with error "Can't assign requested address"

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