Doesn't PASV get around the firewall issues?  It seems to be the default
most places now.  


Len Rugen

"In theory, there is no difference between theory and practice. But in
practice, there is." 
- Yogi Berra 


FTP with TLS has its own set of problems - mostly related to headaches
for
firewalls and NAT routers, since FTP uses multiple socket connections.
SSH
is much cleaner in this respect, which is one reason why it is so
popular.

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