So now in /home/me/.ssh/ I have id_rsa_com.pub id_rsa_old.pub id_rsa.pub. I open Remote Desktop Client and edit a new SSH connection. For my "Identity File" I select my id_rsa.pub, type the server address, and try to connect, but it gives me this error.
Load your private key
Go to Conversions->Export OpenSSH and export your private key
Copy your private key to ~/.ssh/id_dsa (or id_rsa).
Create the RFC 4716 version of the public key using ssh-keygen
ssh-keygen -e -f ~/.ssh/id_dsa > ~/.ssh/id_dsa_com.pub
Convert the RFC 4716 version of the public key to the OpenSSH format:
ssh-keygen -i -f ~/.ssh/id_dsa_com.pub > ~/.ssh/id_dsa.pub