[Bug 1928] New: Allow cancellation of forwardings in multiplexing

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https://bugzilla.mindrot.org/show_bug.cgi?id=1928

             Bug #: 1928
           Summary: Allow cancellation of forwardings in multiplexing
    Classification: Unclassified
           Product: Portable OpenSSH
           Version: 5.8p2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: ssh
        AssignedTo: unassigned-bugs at mindrot.org
        ReportedBy: a2493041 at nepwk.com


"It also allows the cancellation of existing remote port-forwardings
using -KR[bind_address:]port."

~# first of all shows really ugly information :-)

Shell doesn't work with muxing connections. However in 5.4 forwardings
were supported with it, but it means you still can't remove
local/remote forwarding without killing the master connection after
they've been established (really annoying with controlpersist).

If I'm wrong on this please let me know, I'd love to be able to know
how to get around it.

http://www.openssh.org/txt/release-5.4
 * Rewrite the ssh(1) multiplexing support to support non-blocking
   operation of the mux master, improve the resilience of the master to
   malformed messages sent to it by the slave and add support for
   requesting port- forwardings via the multiplex protocol. The new
   stdio-to-local forward mode ("ssh -W host:port ...") is also
   supported. The revised multiplexing protocol is documented in the
   file PROTOCOL.mux in the source distribution.

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