Canada Post shipping calculation inquiry

From drupal.org forums (http://drupal.org/node/111805) :

I have installed the E-commerce module for my drupal site with the intention that I use the Canada Post shipcalc with it.
When I first registered for the VentureOne small business program by Canada Post. For a week, the IP address : http://206.191.4.228:30000
which was part of the canadapost.inc code to access the Canada Post server works. However, after a week, I keep getting fsockopen error "access denied" whenever I test my shopping cart and I am in the part where a shipping calculation is done.

I checked the Canada Post website and I since discovered that since November 30, 2006 they have changed the IP address/url that you use to access the shipping calculations to sellonline.canadapost.ca:30000

So I change the settings to point to the new URL, but ever since I get iffy results. Before when I never get any errors when I go to the shipping calculation section
of the checkout process. Now, I have variable results. There are times where I get the shipping calculation in one try, other times I get it after pressing
continue 2 or 3 or 4 times. And I keep getting this "canadapost configuration error. Please notify the site administrator." error Then after a couple of tries
the shipping calculations would go through.

Any help would be appreciated

Please post some help in the forums http://drupal.org/node/111805, and make note of that change with Canada Post's url.