Trouble returning metadata from Centova via CURL

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Our developer is building a royalty tracking database system for us and is using CURL to pull in track metadata from Centova v3.2.8 using a URL of the form
"https://streams.ourstation.org:2199/rpc/ourstation/streaminfo.get"

When he built the prototype on his own system the CURL operation worked fine. We commissioned a new and separate server with a separate hostname within our domain - let's call it admin.ourstation.org -  to run the database system on, and he has transferred the system across - and the CURL operation now fails, returning: "Failed to connect to streams.ourstation.org port 2199: Connection refused’

Meanwhile, he can successfully recover data from other sources using the new server, and from his development system he can access the data on our Centova installation - ie it is specifically the operation between the two hosts ONLY that is failing.

Can anyone shed any light on this? We tend to think it might be due to the two servers being hosts in the same domain (they are physically in different countries) but can't find this documented anywhere and have no idea why that might be the case. In addition, it doesn't matter if the URL specifies http or https.

Many thanks in advance.
R