Trouble connecting to an OPC server

Hi guys,
The problem is connecting to a mass spectrometer, for which I have a dedicated LAN cable connection and an IP address. I can ping the device, and connecting to the OPC server works with the Softing OPC client, by manually entering the IP address of the server. However it does not show up in the remote machines list when I try to connect to it with via new I/O server. Is there a way to connect directly to an OPC server having only it's IP address?

Our lab was shut down for the holidays period, so I couldn't try anything for a while. Back on it now though.
Thanks for your suggestions! However, I still can't reach the server. Some more details in this post.
The server explorer doesn't see the device either. I think both the
server explorer and LabVIEW actually browse the network looking for
machines running some kind of Samba (SMB) server? That's at least
suggested by the characteristic '\\' added to the machine name I put in
there. I don't think the Mass Spectrometer is running an SMB server. It
does run http and OPC servers, and I believe that's it. So it's not 'visible' on
the Windows network. Is that a problem?
When I enter the IP address of the machine at the new IO server window,
it automatically adds the '\\' in front and gives the 'No such
interface supported' error described in the previous post. When I put
in the IP address of a non-existing machine it gives a different error
('The RPC server is unavailable') after a few seconds. So it does seem
to know there is a machine there, just it can't interface with it.
Reconfiguring the client side DCOM settings according to recipe above didnt seem to make a difference.
Anyone?

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