In the console you connect to a server in the same way you connect to a SDR radio only you search for a radio of type V3 Server (at the bottom of the search list).
In the search window enter the address of the computer where the server software is installed, a valid username/password and press Search. A list of available radios is shown in the Defns area below.
Click SDR Space to display a list of V3 servers as shown on http://www.sdrspace.com/Version-3, if the entry does not have a username/password then you must contact the owner of the server and ask for access information.
When connected to a server the V3 Server button is shown in the ribbon bar.
The V3 Server options are:
A description of the remote server as defined in the Welcome Text pane of the Server Manager (see below).
This software uses an internal buffer to ensure the remote data (IQ) is streamed without breaks if your internet connection slows down or is interrupted. When you start the remote radio the buffer will start to fill; when it reaches the buffering level (usually 100ms) the radio starts displaying the data in the waterfall and audio will be heard. If the buffer becomes empty due to an interruption in the network the above logic is applied again - it is preferable to have fewer breaks like this. The suggested value is 100ms - only if you are suffering from a very erratic network connection should you need to increase this value.
In your router:
This error message is returned when your WAN (internet) access is blocked by the firewall in the Server Manager. If there are any whitelist (allow) entries then your public (WAN) IP must be in the list.