Syntax with slashes - as described - does not work: mfaux@reykjavik ~ % ssh -L '1234/::1/1234' 1.2.3.4 Bad local forwarding specification '1234/::1/1234' Workaround: Use "enclosing address in square brackets" method: "ssh -L '1234:[::1]:1234'".
The '/' separated form is deprecated and has been removed from the manual pages in recent OpenSSH.
Move resolved bugs to CLOSED after 5.7 release