把服务端放在linux上，客户端放在windows上，但是windows连不上服务端

可以ping通，并且linux下telnet也是可以通信的，请问这是什么原因呢？ 2017/07/19 11:10:11 an error!dial tcp 39.108.236.252:7778: connectex: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond. exit status 1