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

1. My config /etc/ssh/ssh_config was ok and was never changed, I found in ~/.ssh/config the rows I needed to change and it solve that issue.

2. if you are getting:

Permissions 0644 for ‘~/.ssh/id_rsa[your file]’ are too open

run: chmod 600 ~/.ssh/id_rsa[your file] to solve it.