ssh with multiple keys fails to use the right one

[dnlmengs]

Even with all the keys configured in the user's .ssh/config file, added to the ssh agent and the right private key file selected by command line, net-ssh fails to select the right key.

example run:

from the development machine, with key dd:20:8d:5d:27:df:a2:bb:ae:6d:11:55:40:b6:a7:b0:
(id from ~$ ssh-keygen -l -E md5 -f ~/.ssh/id_rsa.pub)

~/itamae_project$ itamae ssh -y nodes/test.yml -h test -u user -i ~/.ssh/id_rsa recipe.rb
 INFO : Starting Itamae...
 INFO : Loading node data from /home/rhialto/src/wape/itamae_infra/nodes/test.yml...
/home/user/.rvm/gems/ruby-2.3.1@itamae/gems/net-ssh-3.2.0/lib/net/ssh/transport/session.rb:198:in `block in poll_message': disconnected: Too many authentication failures for user from 49.49.49.49 port 33208 ssh2 (2) (Net::SSH::Disconnect)

server's ssh daemon log in debug mode from the same run:

... not interesting ...
sshd[3578]: Connection from 49.49.49.49 port 33208 on 192.168.17.4 port 22
...
sshd[3578]: Failed publickey for user from 49.49.49.49 port 33208 ssh2: RSA fd:ec:7a:29:ea:d3:48:7b:d7:4a:77:d2:bf:8f:09:fc
...
sshd[3578]: Failed publickey for user from 49.49.49.49 port 33208 ssh2: RSA eb:e3:42:1e:25:3a:cc:f1:50:ab:99:69:9d:dd:c2:bc
...
sshd[3578]: Failed publickey for user from 49.49.49.49 port 33208 ssh2: RSA a7:99:7e:1e:ce:74:bd:e3:d7:f9:cf:be:e3:88:af:06
...
sshd[3578]: Failed publickey for user from 49.49.49.49 port 33208 ssh2: RSA 86:6e:d6:de:e5:94:af:90:28:ef:a7:bd:37:95:de:e5
...
sshd[3578]: Failed publickey for user from 49.49.49.49 port 33208 ssh2: RSA ed:38:c0:f3:42:47:60:41:4c:97:8a:9b:a1:b2:6d:f1
...
sshd[3578]: Failed publickey for user from 49.49.49.49 port 33208 ssh2: RSA f3:1d:13:8f:ad:7a:26:b4:83:12:61:38:51:d8:50:af
sshd[3578]: Disconnecting: Too many authentication failures for user from 49.49.49.49 port 33208 ssh2 [preauth]
...