The DCC Server listens on port 59 by default, however you can change this to another port number. You can have the DCC Server listen for only certain types of connections, such as DCC Sends, Chats, or File server requests. For example, if you turn off the DCC Chat listen option, the DCC Server will ignore any chat requests. Perform DNS lookup When someone connects to your DCC Server only their IP address is available for identification. For a technical specification of the DCC Server protocol, see below.
Connection is established, and Server dcc gets the file.
Connection is established, and Server dcc sends the file. If server receives unexpected information, or doesn't receive info 15 seconds after initial connection, it closes the connection. Since the client was able to connect to the DCC Server the first time, it should have no problem connecting to the same port again. All other attempts to Get a file via the DCC Server are ignored.