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Here is the debug:
<?xml version="1.0" encoding="UTF-8"?>
<Error><Number>80040B1A</Number><Description>API Disabled: RateV3. The RateV3 API is no longer available. Please follow the "RateV3 to RateV4" transition guide in the announcements section at www.usps.com/webtools to migrate to the latest version or contact your software provider or shipping administrator for assistance.</Description><Source>USPSCOM::DoAuth</Source></Error>
How to fix this? Thanks!
You need to upgrade to the current USPS September 7, 2014 K5 shipping module:
http://www.zen-cart.com/showthread.p...014-Version-K5
You should also signup for the News & Announcement Forum so that you get notices that we release about updates ...
http://www.zen-cart.com/forumdisplay...-Announcements
Did I read Zen Cart version 1.3.8a? If so, it is past time to do an upgrade of Zen Cart (I'd suggest a site rebuild).
When ready to deploy the updated site (Zen Cart 1.5.3 or newer), make sure the hosting provider is running compatible versions of PHP and MySQL (PHP 5.3 and older are EOL).