Simple fopen request not working with specific rss feed
The error message says this is a network problem, not an application level one (i.e. not PHP/curl etc.). As I can not access this URL either, this is likely the remote server/server's network provider issue, not your shared server.
Why is it working for you local server? Two options: by some chance there is internet routing between you and 4over.com; or you have an entry for that hostname in your hosts file which resolves to a correct IP address.
the connection timeout indicates that its not a problem with your app or php, much more likley with your environment. are there any firewalls, proxies, etc. which could block your request?
try a plain curl request from your commandline:
$ curl https://trade.4over.com/and see if you have any problems.