解决ssh连接提示Connection closed by xx
某一天ssh连接外网的一个服务器A，突然连不了了，会提示:Connection closed by A的ip,连局域网内的一台服务器B却没有问题，(机子均为linux)
服务器B上ssh连接A没有问题，但是无法用scp传文件给A,传输会一直挂住。
改了各种配置文件，没有解决。
输出信息如下：
ssh -v a@10.80.97.241
OpenSSH_6.6.1, OpenSSL 1.0.1k-fips 8 Jan 2015
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 20: Applying options for *
debug1: Connecting to 10.80.97.241 [10.80.97.241] port 22.
debug1: Connection established.
debug1: identity file /home/zengming/.ssh/id_rsa type -1
debug1: identity file /home/zengming/.ssh/id_rsa-cert type -1
debug1: identity file /home/zengming/.ssh/id_dsa type -1
debug1: identity file /home/zengming/.ssh/id_dsa-cert type -1
debug1: identity file /home/zengming/.ssh/id_ecdsa type -1
debug1: identity file /home/zengming/.ssh/id_ecdsa-cert type -1
debug1: identity file /home/zengming/.ssh/id_ed25519 type -1
debug1: identity file /home/zengming/.ssh/id_ed25519-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_6.6.1
debug1: Remote protocol version 2.0, remote software version OpenSSH_6.4
debug1: match: OpenSSH_6.4 pat OpenSSH* compat 0x04000000
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: server->client aes128-ctr hmac-md5-etm@openssh.com none
debug1: kex: client->server aes128-ctr hmac-md5-etm@openssh.com none
debug1: sending SSH2_MSG_KEX_ECDH_INIT
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
Connection closed by 10.80.97.241
后面在本机上修改了mtu为1500以下就好了：
sudo ifconfig enp0s25 mtu 1200
作者：帅得不敢出门 程序员群：31843264
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