I've checked out the link you sent, and am able to deduce the following information.
1. Your test product does have valid weights and dimensions.
2. At the time of testing (9.15pm SA time) the quotation requests are reaching the server, and a response is being returned.
In other words you don't have any connectivity issues.
I have also been able to confirm that you have a problem with the popup shipping estimator, but I can't determine the cause without further investigation.
Now, you may be wondering how I can confirm the shipping estimator stuff is all ok even though the popup doesn't work correctly? The answer is simple.. I proceeded to the checkout and up popped the AustPost quotes - all correct and valid. :-)
I can't explain why you would have got an "ERROR:Unable to obtain a valid quote from the Australia Post Server." when you tried a checkout unless you were
a) using using a different test product with different dimensions,
b) there was a temporary network glitch when you tried,
c) the delivery address of the login account you used at the time has an invalid postcode.
d) You switched the file access method cURL vs FILE at some stage between your testing and my testing.
It appears that your main issue at this stage is the popup shipping estimator not working (as opposed to not being able to obtain valid quotes), and I *think* I know what the problem *may* be (a bug in my code).
To confirm my suspicion (and to fix the problem) please find and locate all files named "tpl_modules_shipping_estimator.php" and delete all of them EXCEPT the one suppied with the _ZenCart_ distribution files.
IF you uploaded your austpost files according to the documention (and default file structure) you will find only two copies of this file, the original in:
/includes/templates/templates/
and the possible troublesome one in
/includes/templates/CUSTOM/templates
As a further tip (that will help you when testing with other products) you currently have your TARE weight set at 3kgs. This means that all of your quotes will be significantly higher than they should be.
Your test product is apparently 2kgs, so with one of these in the cart you are being quoted on a 5kg package, if you have ten in the cart you will exceed the macimum weight limits.
Cheers
Rod






