void silc_client_close_connection(SilcClient client,
                                      SilcClientConnection conn);

    Closes the remote connection `conn'.  The `conn' will become invalid
    after this call.  Usually this function is called only when explicitly
    closing connection for example in case of error, or when the remote
    connection was created by the application or when the remote is client
    connection.  Server connections are usually closed by sending QUIT
    command to the server.  However, this call may also be used.