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comment ssh-agent forwarding and sudo to another user
On my server (Ubuntu 12.04, ssh version OpenSSH_5.9p1 Debian-5ubuntu1.1, OpenSSL 1.0.1 14 Mar 2012), ssh has -a and -A arguments. -a does the exact opposite of what's intended, it disables agent forwarding! So, under recent (and possibly all) version of Ubuntu, use -A to enable agent forwarding.