Hello

Thanks for the replies first of all. I have checked the NAT settings on
their server and they are set up to forward port 5900 connections
correctly. Could there be an IP restriction in place already? If so
where & how do i check? I know the other company could access the
server without them creating the connection so this sounds possible.

Thanks again for your replies, any more help will be greatly
appreciated.

Regards, Gareth