[Info-vax] preventing FTP from timing out

[Stephen Hoffman]

On 2012-10-02 23:24:35 +0000, Phillip Helbig---undress to reply said:

> In article <k4feec$788$1 at dont-email.me>, Stephen Hoffman
> <seaohveh at hoffmanlabs.invalid> writes:
> 
>> FTP opens a second connection - for the data transfer - in a way that
>> can and variously is blocked by the firewalls that often lurk within
>> network connections these days, which means folks managing FTP
>> transfers are tussling with the related errors, or they're using an
>> FTP-aware firewall, or (less desirably) have configured a DMZ FTP
>> server that's running with the ephemeral port range wide open.
> 
> This can confuse some people, but hopefully not the tech types.

And FTP can sometimes confuse the tech types, too.

> There is also "passive mode" FTP.

Follow the active and passive connections, assuming there's a firewall 
in front of the client and another one in front of the server, and see 
what (doesn't) happen at the intervening firewalls.



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