Saying so would be nice I guess, but I don't think it's particularly
important.

The current implementation/configuration is that Launchpad's use of the
Twisted Conch library explicitly overrides the channelLookup dict to
only have 'session'.  So when the client tries to open a direct-tcpip
channel, Conch consults that dict (via the lookupChannel method), does
not find an entry for direct-tcpip, so returns the "unknown channel
type" error code.

It would be possible for Launchpad to arrange for direct-tcpip to
instead return the "adminstratively prohibited" error code, but that's
really just cosmetics.  Either way the port forwarding request is
immediately rejected, just the error text the client prints is
different.

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https://bugs.launchpad.net/bugs/689213

Title:
  PPA sshd configuration

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