I have a situation where I would like to rsync some files from a remote server to a server in my office. The source server requires key-based authentication and I have an appropriate key set up on my desktop machine.

If I ssh into the local server and then ssh to the remote server, ssh agent forwarding works correctly. However, when I try to rsync over ssh I get permission denied.

So, Desktop --> Local server --> Remote server. When ssh'd onto the local server

ssh user@remote

works, but

rsync -avPe ssh user@remote:/src /dest

does not - Permission denied (publickey).