下面的调试信息或者会有帮助。
$ git fetch
Bad packet length 1397966893.
Disconnecting: Packet corrupt
fatal: The remote end hung up unexpectedly
$ ssh -T git@coding.net -vvv
OpenSSH_5.9p1 Debian-5ubuntu1.4, OpenSSL 1.0.1 14 Mar 2012
debug1: Reading configuration data /home/honwhy/.ssh/config
debug1: /home/honwhy/.ssh/config line 1: Applying options for coding.net
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug2: ssh_connect: needpriv 0
debug1: Connecting to coding.net [118.192.93.38] port 22.
debug1: Connection established.
debug3: Incorrect RSA1 identifier
debug3: Could not load "/home/honwhy/.ssh/coding_rsa" as a RSA1 public key
debug1: identity file /home/honwhy/.ssh/coding_rsa type 1
debug1: Checking blacklist file /usr/share/ssh/blacklist.RSA-2048
debug1: Checking blacklist file /etc/ssh/blacklist.RSA-2048
debug1: identity file /home/honwhy/.ssh/coding_rsa-cert type -1
debug1: Remote protocol version 2.0, remote software version OpenSSH_6.2
debug1: match: OpenSSH_6.2 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_5.9p1 Debian-5ubuntu1.4
debug2: fd 3 setting O_NONBLOCK
debug3: load_hostkeys: loading entries for host "coding.net" from file "/home/honwhy/.ssh/known_hosts"
debug3: load_hostkeys: loaded 0 keys
debug1: SSH2_MSG_KEXINIT sent
Bad packet length 1397966893.
Disconnecting: Packet corrupt
某草草2017-04-27 09:04:44
After my search, the problem was solved
Refer to these two links
https://blog.flameeyes.eu/2011/01/mostly-unknown-openssh-tricks
https://blogs.oracle.com/janp/entry/ssh_messages_code_bad_packet
The following is the modified ~/.ssh/configconfiguration
Host coding.net
HostName coding.net
User myemail@mydomain.com
IdentityFile /home/honwhy/.ssh/coding_rsa
Protocol 2
ControlMaster auto
ControlPersist yes
These two lines of configuration are more important
ControlMaster auto
ControlPersist yes
An error will still be prompted when connecting for the first time, but the connection will be normal the second time.
You should really read the manual or RFC for the detailed process. The second link also explains it very specifically.