遇到一个关于 ssh 的奇怪的问题

最近我的 Mac 下的 ssh 没法正常登陆了，之前是可以的。一开始怀疑是移动的网络问题，于是切换到手机热点上（联通的手机号），发现就可以登陆了。只要切回家里的固网（移动），就无法登陆。

但是奇怪的是，在移动的网络下，我用 Mac 里的虚拟机（ Vbox，安装的 centos7 mini ）却可以正常登陆。

然后怀疑是不是服务器的问题，换了好几个服务器（无论国内的还是国外的），都是上面的问题。

现在发现在 Mac 下能 ssh 到局域网里的任一一台开了 ssh 服务的电脑上，只要连接外网的就不行了。。。

下面是各种信息：

使用 ssh root@xxxx 显示的错误信息如下：

➜  ~ ssh [email protected]
packet_write_wait: Connection to x.x.x.x port 22: Broken pipe

使用 ssh -vvvvv root@xxxx 显示的登陆信息如下：

➜  ~ ssh -vvvvv [email protected]
OpenSSH_7.5p1, OpenSSL 1.0.2k  26 Jan 2017
debug1: Reading configuration data /Users/ety001/.ssh/config
debug1: /Users/ety001/.ssh/config line 1: Applying options for *
debug1: Reading configuration data /usr/local/etc/ssh/ssh_config
debug2: resolving "xxx.net" port 22
debug2: ssh_connect_direct: needpriv 0
debug1: Connecting to xxxxx.net [x.x.x.x] port 22.
debug1: Connection established.
debug1: identity file /Users/ety001/.ssh/id_rsa type 1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/ety001/.ssh/id_rsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/ety001/.ssh/id_dsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/ety001/.ssh/id_dsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/ety001/.ssh/id_ecdsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/ety001/.ssh/id_ecdsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/ety001/.ssh/id_ed25519 type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/ety001/.ssh/id_ed25519-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_7.5
debug1: Remote protocol version 2.0, remote software version OpenSSH_6.6.1
debug1: match: OpenSSH_6.6.1 pat OpenSSH_6.6.1* compat 0x04000000
debug2: fd 5 setting O_NONBLOCK
debug1: Authenticating to xxxxx.net:22 as 'root'
debug3: put_host_port: [xxxxx.net]:22
debug3: hostkeys_foreach: reading file "/Users/ety001/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /Users/ety001/.ssh/known_hosts:3
debug3: load_hostkeys: loaded 1 keys from [xxxxx.net]:22
debug3: order_hostkeyalgs: prefer hostkeyalgs: [email protected],[email protected],[email protected],ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521
debug3: send packet: type 20
debug1: SSH2_MSG_KEXINIT sent
debug3: receive packet: type 20
debug1: SSH2_MSG_KEXINIT received
debug2: local client KEXINIT proposal
debug2: KEX algorithms: curve25519-sha256,[email protected],ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1,ext-info-c
debug2: host key algorithms: [email protected],[email protected],[email protected],ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,[email protected],[email protected],ssh-ed25519,rsa-sha2-512,rsa-sha2-256,ssh-rsa
debug2: ciphers ctos: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected],aes128-cbc,aes192-cbc,aes256-cbc
debug2: ciphers stoc: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected],aes128-cbc,aes192-cbc,aes256-cbc
debug2: MACs ctos: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: MACs stoc: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,[email protected],zlib
debug2: compression stoc: none,[email protected],zlib
debug2: languages ctos: 
debug2: languages stoc: 
debug2: first_kex_follows 0 
debug2: reserved 0 
debug2: peer server KEXINIT proposal
debug2: KEX algorithms: [email protected],ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1
debug2: host key algorithms: ssh-rsa,ecdsa-sha2-nistp256,ssh-ed25519
debug2: ciphers ctos: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,[email protected],[email protected],[email protected],aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,[email protected]
debug2: ciphers stoc: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,[email protected],[email protected],[email protected],aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,[email protected]
debug2: MACs ctos: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-md5,hmac-sha1,[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,[email protected],hmac-sha1-96,hmac-md5-96
debug2: MACs stoc: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-md5,hmac-sha1,[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,[email protected],hmac-sha1-96,hmac-md5-96
debug2: compression ctos: none,[email protected]
debug2: compression stoc: none,[email protected]
debug2: languages ctos: 
debug2: languages stoc: 
debug2: first_kex_follows 0 
debug2: reserved 0 
debug1: kex: algorithm: [email protected]
debug1: kex: host key algorithm: ecdsa-sha2-nistp256
debug1: kex: server->client cipher: [email protected] MAC: <implicit> compression: none
debug1: kex: client->server cipher: [email protected] MAC: <implicit> compression: none
debug3: send packet: type 30
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug3: receive packet: type 31
debug1: Server host key: ecdsa-sha2-nistp256 SHA256:5zOu4ru/1gSApCpW9fJxoajN2h9eIiK01UmGb+m2jJU
debug3: put_host_port: [x.x.x.x]:22
debug3: put_host_port: [xxxxx.net]:22
debug3: hostkeys_foreach: reading file "/Users/ety001/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /Users/ety001/.ssh/known_hosts:3
debug3: load_hostkeys: loaded 1 keys from [xxxxx.net]:22
debug3: hostkeys_foreach: reading file "/Users/ety001/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /Users/ety001/.ssh/known_hosts:3
debug3: load_hostkeys: loaded 1 keys from [x.x.x.x]:22
debug1: Host '[xxxxx.net]:22' is known and matches the ECDSA host key.
debug1: Found key in /Users/ety001/.ssh/known_hosts:3
debug3: send packet: type 21
debug2: set_newkeys: mode 1
debug1: rekey after 134217728 blocks
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug3: receive packet: type 21
debug1: SSH2_MSG_NEWKEYS received
debug2: set_newkeys: mode 0
debug1: rekey after 134217728 blocks
debug2: key: /Users/ety001/.ssh/id_rsa (0x7fdab86157a0)
debug2: key: /Users/ety001/.ssh/id_dsa (0x0)
debug2: key: /Users/ety001/.ssh/id_ecdsa (0x0)
debug2: key: /Users/ety001/.ssh/id_ed25519 (0x0)
debug3: send packet: type 5
debug3: receive packet: type 6
debug2: service_accept: ssh-userauth
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug3: send packet: type 50
debug3: receive packet: type 51
debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,password
debug3: start over, passed a different list publickey,gssapi-keyex,gssapi-with-mic,password
debug3: preferred publickey,keyboard-interactive,password
debug3: authmethod_lookup publickey
debug3: remaining preferred: keyboard-interactive,password
debug3: authmethod_is_enabled publickey
debug1: Next authentication method: publickey
debug1: Offering RSA public key: /Users/ety001/.ssh/id_rsa
debug3: send_pubkey_test
debug3: send packet: type 50
debug2: we sent a publickey packet, wait for reply
debug3: receive packet: type 60
debug1: Server accepts key: pkalg ssh-rsa blen 279
debug2: input_userauth_pk_ok: fp SHA256:9EoXx7zbgyXd45tiqLXoXXQ1xo3Agt99pvlmAYXyR/k
debug3: sign_and_send_pubkey: RSA SHA256:9EoXx7zbgyXd45tiqLXoXXQ1xo3Agt99pvlmAYXyR/k
debug3: send packet: type 50
debug3: receive packet: type 52
debug1: Authentication succeeded (publickey).
Authenticated to xxxxx.net ([x.x.x.x]:22).
debug1: channel 0: new [client-session]
debug3: ssh_session2_open: channel_new: 0
debug2: channel 0: send open
debug3: send packet: type 90
debug1: Requesting [email protected]
debug3: send packet: type 80
debug1: Entering interactive session.
debug1: pledge: network
debug3: receive packet: type 91
debug2: callback start
debug2: fd 5 setting TCP_NODELAY
debug3: ssh_packet_set_tos: set IP_TOS 0x10
debug2: client_session2_setup: id 0
debug2: channel 0: request pty-req confirm 1
debug3: send packet: type 98
debug2: channel 0: request shell confirm 1
debug3: send packet: type 98
debug2: callback done
debug2: channel 0: open confirm rwindow 0 rmax 32768

在这里卡住很久，然后是下面的信息

debug3: send packet: type 1
packet_write_wait: Connection to x.x.x.x port 22: Broken pipe

可以看到已经 Authenticated , 但是会最终卡住，即使按 ctrl + c 也是没有反应的，只能等超时自己断开。

表示在 google 上搜了好几天了，除了看到 N 年前的 bug 报告，没有看到任何有用的信息。

尝试使用 brew 重新另安装了一个，也是一样的结果。

已经被这个问题折腾崩溃。。。。。。