It must be something wrong with the hosting setup.

Because when i setup the Drupal+ubercart into a new domain name with different
hosting, everything works well.

Anyone has the same problem ??

Please help me....i need to turn this project today.
But still has problem with UPS shipping.

Here is the comparison (same code)
http://dirtyredgear.com/shop/

and

http://vistadigitaltech.info/

NB: the hosting with UPS Error(can;t send data to UPS) is under 'reseller hosting'.
Configuration:
Php 5.2.5
Apache/1.3.39 (Unix) mod_auth_passthrough/1.8 mod_log_bytes/1.2 mod_bwlimited/1.4 FrontPage/5.0.2.2635 mod_ssl/2.8.30 OpenSSL/0.9.7a