Error: Server login failed. Authentication by SSH key failed!. Remote Error: (1) if: Expression Syntax..
Error: Server login failed. Authentication by SSH key failed!. Remote Error: (1) if: Expression Syntax..
Make sure the ssh user is using the bash shell.
finger <username> or grep <username> /etc/passwd would show the shell in use.
To change shell, use the command
chsh -s /bin/bash <username>