irssi.conf

servers = (...
  {
    address = "irc.freenode.net";
    chatnet = "freenode";
    port = "6667";
    use_ssl = "no";
    ssl_verify = "no";
    autoconnect = "no";
  },
  ...);

channels = (...
  { name = "#adaptiveunm"; chatnet = "freenode"; autojoin = "yes"; },
  ...);