cant connect from cluster to node via ssh without password

[informant]

hi all, after last time we have the problem, that we can not connect from cluster to all nodes without passwort. 2 nodes we can connect without passwort via ssh from cluster but many other nodes we get a passwort question to login via ssh from cluster. other way not working node to cluster login via ssh works without password. but cluster to node only with. how can we fix it? any ideas?
regards

 

[Chris]

Can you check what option is set for 'ChallengeResponseAuthentication' in the sshd config under '/etc/ssh/sshd_config' on the nodes asking for a password? Also is there a private key '.ssh/id_rsa' in the home folder of the node you want to connect from?

 

[informant]

hi, ChallengeResponseAuthentication is set to "no". i have readd ssh key, after remove manualy in etc keys and in know-hosts, and it works fine. thanks. best regards

 

[roadrunner_rad]

hi, ChallengeResponseAuthentication is set to "no". i have readd ssh key, after remove manualy in etc keys and in know-hosts, and it works fine. thanks. best regards

Hi, seens that I have a similar issue, can you please explain in detail what leads to your success ? What files did you clear/remove ? Thx in advance

 

[roadrunner_rad]

Hi, in my case there was an issue with permissions of /etc. I found it by running a second sshd on one node

/usr/sbin/sshd -p222 -d

and

ssh -vvv -p 222 node2

the server then complains about:

debug1: trying public key file /root/.ssh/authorized_keys
debug1: fd 4 clearing O_NONBLOCK
Authentication refused: bad ownership or modes for directory /etc

Ownership was:

drwxrwxrwx 104 root root 12288 Oct 19 06:25 etc

a

chmod go-w /etc

did the trick but no glue how the permission changed on /etc