2017-12-11 21:41:39: ERROR[Main]: Connection failure: init packet not recognized by server.
2017-12-11 21:41:39: ERROR[Main]: Most likely the server uses an old protocol version (<v25).
2017-12-11 21:41:39: ERROR[Main]: Please ask the server owner to update to 0.4.13 or later.
2017-12-11 21:41:39: ERROR[Main]: To still connect to the server in the meantime,
2017-12-11 21:41:39: ERROR[Main]: you can enable the 'send_pre_v25_init' setting by editing minetest.conf,
2017-12-11 21:41:39: ERROR[Main]: or by enabling the 'Client -> Network -> Support older Servers'
2017-12-11 21:41:39: ERROR[Main]: entry in the advanced settings menu.