-# Many sites are behind firewalls that do not allow initiation of
-# connections from the outside. On these sites you have to use the
-# `passive' feature of FTP. If you are behind such a firewall, you
-# can turn this on to make Wget use passive FTP by default.
+# By default Wget uses "passive FTP" transfer where the client
+# initiates the data connection to the server rather than the other
+# way around. That is required on systems behind NAT where the client
+# computer cannot be easily reached from the Internet. However, some
+# firewalls software explicitly supports active FTP and in fact has
+# problems supporting passive transfer. If you are in such
+# environment, use "passive_ftp = off" to revert to active FTP.