ERROR: Permission denied (publickey).

This message appears when the remote ssh server has password authentication disabled.

To fix this, edit /etc/ssh/sshd_config to enable password authentication:

PasswordAuthentication yes

Restart the SSH service on the remote server after that

Slow SSH connection time

If connecting to a remote server usually takes a long time to complete, then probably the cause is a faulty reverse DNS resolution performed by SSH when connecting.

To disable this option (and make the SSH login much faster, add in the file /etc/ssh/sshd_config on the remote server the following:

if the remote server is Solaris:

LookupClientHostnames no

or

if the remote server is Linux:

UseDNS no

Restart the SSH service on the remote server for this modification to take effect