Most of realtime shipping services (UPS, FedEx) and payment processors (PayPal, Google Checkout, AuthorizeNet.Aim, etc.) require PHP Curl support on your server. If your realtime shipping method does not pass shipping rates from the shipping service server, or orders get the Failed status after they are paid using a payment processor, it may be caused by a problem with the CURL PHP extension on your server.
If PHP Curl extension is installed on your server, but real-time shipping services do not work, the problem is likely caused by the fact that the server uses proxy. If that is the case, follow the instructions below:
Hint
If your hosting provider is GoDaddy, enter the following parameters:
Proxy host: 64.202.165.130
Proxy port: 3128
Proxy user: leave blank
Proxy password: leave blank
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