In order to be able to connect from the machine hosting my jenkins server to a Windows slave via ssh I have to pass the option -c aes128-ctr to the ssh command. I can do it from inside the container where my Jenkins server is running.

How can I set this configuration option to the embedded ssh in Jenkins?

For the command line, I can avoid the need to pass the option explicitly by putting something like this in the ~/.ssh/config file:

Host slave_name
  Ciphers aes128-ctr

It seems that Jenkins's ssh isn't reading this file though.

I've looked at the plugin source but I couldn't find any mention of the configuration file.