Thomas, that could be multiple things, first hunch would be security related issue, does it open if you drop the URL into a web browser on the machine you are using? Actually, just realized we could use a bit more information here as well, is this Desktop Client, or server client etc...? If you can provide some further details of the situation/use case, that should help, but my first check would be security side of things.
Regards, Brett
To help users find verified answers, please do not forget to use the "Accept as Solution" button on any post(s) that helped you resolve your problem or question. I now work a compressed schedule, Tuesday, Wednesday and Thursday, so those will be the days I will reply to any follow-up posts.