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You are correct and Scott was a little strong on his opinion there. While it
is not REQuIRED to have your systems name and IP address in it's own host
table for things to work correctly it is usually the case. The only time it
works well NOT to have the name in there is if DNS is set up to inlclude the
proper entries. Servers such as *SMTP *MGTC *HTTP(ADMIN) and others need to
know that the name being used resolves an IP address that is on the system.
Without this, "Unpredictable (but predictably bad) results will occur."
I can see why that would be needed for e-mail. The other thing it might
be useful for is verifying digital certificates. I don't see why you'd
need it for HTTP or MGTC.
But frankly, if you're using the HOST TABLE to verify digital
certificates, or route e-mail, something is very wrong.
With e-mail, it means that you have to define every mail server and
destination system in your host table for the entire world. And keep it up
to date! Why wouldn't you just set up DNS?
For digital certificates, what you're doing is bypassing the security
checks. It's not REALLY validating the certificate, because you could set
any value you wanted in the host table whether it's correct or not. It
would be more of a workaround to avoid proper validation than anything
else.
I maintain that it's a very bad idea.
Also, none of this relates to FTP, which was the question. When FTP data
channels are established, it's the IP address that's sent with the PORT
command, or as a response to the PASV command. Not the domain name. So
DNS/HOST lookup will NOT cause a data channel connection to fail -- which
is clearly what's failing.
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