Hi Dominic,
Thanks for the quick reply. I am not at the web server right now and given Monday is a public holiday, I can get you that information on Tuesday.
From memory however, the IIS server can visit www.zen-cart.com but when pinged the server replies with 'Destination net unreachable' 3/4 times. It's still a reply but not with the 32b of data.
Could this be the issue?
If so what specifically should I ask our DNS admin to do? Is there any way to open a port for curl to communicate with whichever server we would like? Or is it better to do it on a case by case basis (after succesfully connecting to zen-cart.com we would need it to work with our payment gateway)?
thanks