Comment 4 for bug 252200

That's certainly gnome-keyring's socket.

I'm going to go ahead mark this bug a duplicate, for a work around please see bug: #209447.

The work around involves resetting your ssh-agent back to the standard one and not gnome-keyring.

However Intrepid introduced a further bug which stops you from doing this, so for a further workaround you'll also need to see bug: #275010

Hope this helps!