ssh 连接失败， ssh_exchange_identification: read: Connection reset by peer

最近在寝室用 wifi 连实验室服务器出现了问题。错误提示是 ssh_exchange_identification: read: Connection reset by peer 。但是用手机开热点后，能成功连接。在网上看了很多资料也不知道具体是什么原因，想请教一下这个问题该怎么解决。

连接的错误消息，我都不确定问题是出在本地客户端还是远程服务器上。

❯ ssh -v myname@server
OpenSSH_6.9p1, LibreSSL 2.1.8
debug1: Reading configuration data /Users/xu/.ssh/config
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 21: Applying options for *
debug1: Connecting to server port 22.
debug1: Connection established.
debug1: identity file /Users/xu/.ssh/id_rsa type 1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/xu/.ssh/id_rsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/xu/.ssh/id_dsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/xu/.ssh/id_dsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/xu/.ssh/id_ecdsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/xu/.ssh/id_ecdsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/xu/.ssh/id_ed25519 type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/xu/.ssh/id_ed25519-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_6.9
ssh_exchange_identification: read: Connection reset by peer

查资料的时候发现好像和 hosts.deny 和 hosts.allow 这两个文件也有关系

> cat /etc/hosts.allow
ALL: 192.168.4.0/255.255.255.0
ALL: 127.0.0.0/255.0.0.0

sshd: 192.168.4.0/255.255.255.0
sshd: 192.168.1.0/255.255.255.0
sshd: 133.9.0.0/255.255.0.0
sshd: .jp
sshd: 114.255.218.0/255.255.255.0

rcpbind: 192.168.4.0/255.255.255.0

> cat /etc/hosts.deny
ALL:ALL