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I've sent up SSH agent forwarding on my local machine, and confirmed it works when I connect to an Ubuntu server hosted behind our proxy. (ssh-add reports a list of keys when I run it on the machine I connect to, and I can successfully ssh into another box from there).

However, when I ssh into a CentOS server hosted in the cloud, I get Could not open a connection to your authentication agent. when I run ssh-add.

What's going on?

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