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I created a new user in my EC2 using:

sudo adduser test

I can add it to sudo using "usermod -aG sudo test" and verify it using "groups test", and I can "su - test" to switch to test.

However, when I tried to login this user from another host(my local MAC terminal) using:

ssh test@EC2_IP

it showed permission denied without even asking me password. ssh -v test@EC_IP shows the following log:

OpenSSH_7.4p1, LibreSSL 2.5.0
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: key_load_public: No such file or directory
......
debug1: Next authentication method: publickey
debug1: Offering RSA public key: /Users/XXX/.ssh/id_rsa
debug1: Authentications that can continue: publickey
debug1: Trying private key: /Users/XXX/.ssh/id_dsa
debug1: Trying private key: /Users/XXX/.ssh/id_ecdsa
debug1: Trying private key: /Users/XXX/.ssh/id_ed25519
debug1: No more authentication methods to try.
Permission denied (publickey).

In fact, I can login a user of another host. ssh -v another@another_host showed almost the same log except two lines:

debug1: Authentications that can continue: publickey,password
....
debug1: Next authentication method: password

for what reason I cannot "ssh test@EC2_IP"? why the system does not check: "debug1: Next authentication method: password"?

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  • 1
    Do you have PasswordAuthentication enabled on both the client and server side?
    – muclux
    Commented Dec 18, 2017 at 8:49
  • If not, share your EC2's /etc/ssh/sshd_config file because it seems to be a misconfiguration in there
    – XiR_
    Commented Dec 18, 2017 at 13:12
  • muclux and XiR_. PasswordAuthentication is no in /etc/ssh/sshd_config. I changed it to yes and then "service sshd reload", it now works!. Thanks. note the EC2 to be logged in is new launched, which I did not change anything. looks like amazon's EC2 set PasswordAuthentication as no by default?
    – user389955
    Commented Dec 19, 2017 at 15:22

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