If you are using a HDS and HCE on the same machine, you have to change the port of the server to something like 2304. You do this by adding "-port *port number*" (without quotes) to the end of your HDS shortcut. You need to leave Halo CE alone for the ports or else it won't communicate with other servers. Also look at your firewall and see if the programs and necessary ports are open and forwarded correctly.
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