游戏请求连接后后端提示这个 log 大概是什么情况？

[crapthings]

版本号 v1.0.0-rc (2015-12-28)
osx 10.13.6

[:01000004] connect from 192.168.50.88:60633 17
[:01000004] disconnect fd = 17, error = ./service/cmaster.lua:35: closed
[:01000004] connect from 192.168.50.88:60674 18
[:01000004] disconnect fd = 18, error = ./service/cmaster.lua:35: closed
[:01000004] connect from 192.168.50.88:60706 19
[:01000004] disconnect fd = 19, error = ./service/cmaster.lua:35: closed
[:01000004] connect from 192.168.50.88:60715 20
[:01000004] disconnect fd = 20, error = ./service/cmaster.lua:35: closed