After update Mac OS Sierra, Can not use ssh login remote system,how can I fix this?

Question

when I use user@ip to login remote system, it report like this:

debug1: /etc/ssh/ssh_config line 17: Applying options for *
/etc/ssh/ssh_config: lin         


        

Answer 1

One way to solve this question is copy a ssh binary from an older Mac and place this binary in path before /usr/bin/ssh, ex: (copy from el capitan box) /usr/bin/ssh => ~/bin/ssh, then add $HOME/bin to your PATH before anything else.

The reason is GSSAPITrustDNS and GSSAPIKeyExchange patches are no longer applied by apple, Starting with Sierra when they upgraded OpenSSH to 7.2p2, So one options is to downgrade to the old OS version, if you have to use kerberos＋ ssh.