[MacPorts] #45655: FTP hosting source code for wcslib not reachable from NATed VirtualBox machines.

[MacPorts]

#45655: FTP hosting source code for wcslib not reachable from NATed VirtualBox
machines.
-------------------------+--------------------
  Reporter:  aszostak@…  |      Owner:  john@…
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.3.1
Resolution:              |   Keywords:
      Port:  wcslib      |
-------------------------+--------------------

Comment (by aszostak@…):

 It does not appear to fail with other FTP servers. I successfully fetched
 the following and see EPSV commands in all 3 cases:
 ftp://puck.nether.net/pub/janc/cursive.tgz
 ftp://ftp.lip6.fr/pub/gnu/libtool/libtool-2.4.2.tar.gz
 ftp://ftp.perforce.com/jam/jam-2.5.tar

 Thus it seems to be a problem with the FTP server itself.
 I glean that from an exchange I had with some members of the MacPorts
 mailing list:

 >>From: Jeremy Lavergne,
 >>
 >>You’re running into a deadlock with FTP: the machines on both sides of
 >>the connection have restrictive firewalls, so additional ports cannot be
 >>opened for listening.
 >
 >From: Dave Horsfall,
 >>
 >But are not FTP servers (not clients) supposed to be active, and outside
 >the firewall (or at least within the DMZ) as a result?

 So my proposal is to set "fetch.use_epsv" to "no" for this particular
 Portfile.

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Ticket URL: <https://trac.macports.org/ticket/45655#comment:3>
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