To avoid confusion, the Jade referred to here meant DALnet's server, jade.va.us.dal.net. I gather you mean a network named JadeNet? Each network has its own servers, and the best thing for you to do is to try to find a webpage for the network you want to connect to. They would have a list of their servers, what you need to do to connect, and hopefully any probs they may be experiencing.
The message "server is full" means just that.. you need to try others on that particular network, and the different server ports they support. Servers have a limit on the number of users they can/will support, and when they are full, thats it until others leave. When nothing at all happens, odds are that the server is down or doesnt exist.