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Forum Discussion
FTP server using passive ports
Hello everybody. This is more of a network-question than a readynas one. I've just recently bought an Ultra 4 in an addition to my Duo. I've had, and still have the FTP service running at the Du...
Chance is next to zero that you will be able to exchange files with your FTP server in active mode when outside your LAN and covered by the corporate NAT. In active mode FTP server initiates connections to the random ports of the client side to transfer data. All that ports are shut down hollow on the corporate firewall.
The passive mode is way around that. But only in case that your corporate firewall lets through outgoing connections within the passive mode data range - this range you specify on your FTP server.
http://wiki.filezilla-project.org/FAQ
"Normal" firewall typically lets through outgoing connections. But "corporate" firewall typically blocks all traffic - incoming and outgoing on all ports with the exception for the few ports specified by corporate network admin. So there are just ports for http, DNS, pop3/smtp/imap (if so) and not much more. But of course I don't know your particular corporate network settings.
The passive mode is way around that. But only in case that your corporate firewall lets through outgoing connections within the passive mode data range - this range you specify on your FTP server.
http://wiki.filezilla-project.org/FAQ
"Normal" firewall typically lets through outgoing connections. But "corporate" firewall typically blocks all traffic - incoming and outgoing on all ports with the exception for the few ports specified by corporate network admin. So there are just ports for http, DNS, pop3/smtp/imap (if so) and not much more. But of course I don't know your particular corporate network settings.
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