If you were to were to just go to the Netscape download page and get Netscape Communicator 4.7, it might solve any problems.
If you got your browser from the NDSU/helpdesk page, you will most likely need to download the java plug in. Here's how:
Another possibility, if you were trying to connect from work, might be that you are behind a firewall and the communications from the server to the client are halted before they reach your workstation. Many firewalls prevent telnet sessions from connecting to "unsecure" sites, and many others prevent telnet sessions from connecting to "non-standard" ports. Dollar Bay requires both of these things, and either of them could cause a firewall to block the connection.