opencart extension problem

We have a problem with an open cart extension we purchased and had installed. The extension is supposed to generate a PDF and allow us to email to the customer. The problem is that the extension is throwing up an error and not including images in the PDF this is making it useless to us. I have pasted the error below for you to see. Warning: file_get_contents([login to view URL]) [function.file-get-contents]: failed to open stream: Connection refused in /home/sites/[login to view URL] on line 28 The extension developer is stating its a server problem, but why and what he isn't saying. Also, we have changed the settings > options to show a different invoice prefix and its not being shown correctly in the invoice prints. We need someone to work out what is wrong and fix it.