Hi, it's me again...
sorry but looking at your post again, it seems I missed out on 3 letters from it: "FTP"
If FTP connections are also suffering form the symptom mentioned, then obviously anything "embedded" on a website doesn't matter. Now it really looks like some kind of networking problem.
If its name resolution... have you (or "something") made any modifications to e.g. the "hosts" file on the machine? Or within the TCP/IP setup? Perhaps also a look into the servers logfiles can give a clue.
Sorry for the mess I left you with.

HTH
Thomas