Also, make sure the settings point to the Production server, rather than Testing. The software on those two machines is completely different, despite all documentation saying otherwise. To me, those error messages look like what happens when you try to parse HTML as XML. Doesn't work too well.
Where do I find this setting? I just got an automated message from USPS that says...
Congratulations on completing your testing of the United States Postal Service® Internet Shipping Application Program Interfaces (APIs). Your profile has been updated to allow you access to the Production Server.
1. The Production Server URL is: production.shippingapis.com.
2. There is a line of code that refers to "shippingapitest.dll". You'll need to remove the word "test".
Joined: 01/11/2008