Seems like a DNS problem on the server.
A test could be to TEMPORARILY add a hosts file entry:
If the problems stop immediately after putting that in the hosts file but re-occur again after removing it, then that strongly suggests that the server's ability to do name resolution is broken.Code:56.0.34.43 production.shippingapis.com #temporary for testing only, Oct 2015; should be removed ASAP
Do remember to remove it from the hosts file after you're done testing, in case USPS changes the IP address in the future.


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