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Support Center » Knowledgebase » TurboFTP Technical Questions » When using SSL I can make the connection, but the list command says "cannot open data connection". Both the sending and target machines are behind firewalls.
 When using SSL I can make the connection, but the list command says "cannot open data connection". Both the sending and target machines are behind firewalls.
Solution If your computer is behind a firewall using NAT, it won't be able to interpret the PASV or PORT command relating to data transfer. You might want to try the Clear Command Channel (CCC) option under [Site Settings | Security] tab combined with the active mode (non-pasv). With such an option your FTP commands will be sent in clear text (of course password / user name are sent in encrypted form) so that firewall / router can see the client's port command and open that port for incoming connection. Data channel is still encrypted.



Article Details
Article ID: 127
Created On: 08 Jun 2007 06:32 PM

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