SSH Forwarding is turned off by default in OS X Maverick and Yosemite. Here are the steps to quickly setup and configure other servers to accept your ssh key

1. Setting SSH Forwarding on OS X
   • Edit the /etc/ssh_config file

     sublime /etc/ssh_config

   • Look for the ForwardAgent line. By default it’ll look like this
     #   ForwardAgent no
     Modify it to
     ForwardAgent yes
   • Save the file. OS X is now configured to forward your SSH Keys
   • For extra security, you could modify your Host configuration from
     Host *
     to
     Host
     <ip address of server you want to enable forwarding for>
2. Create and enable your own SSH keys if you haven’t yet
3. Set up ssh-copy-id
   • Install ssh-copy-id via HomeBrew

     brew install ssh-copy-id

   • Run ssh-copy-id to the server you want to copy your ssh-key to. This assumes you already have an existing login to the server you need to access

     ssh-copy-id <username>@<server ip or server name>

4. You should now be able to SSH to the server without using your username and password but rather your SSH Key going forward. To do that, you type the following:

   ssh -A <username>@server ip or server name>