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Old 03-16-2022, 05:03 PM   #1
MxxCon
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Location: Brooklyn, NY
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When ftp client is in passive mode(sends PASV command), it asks ftp server for IP:PORT to which to connect for data connection.
When ftp client is in active mode it sends PORT command which tells ftp server to which IP:PORT it should try to connect for data connection.


Unless a user has a smart enough router that monitors and understand FTP connection's commands, or if FTP encryption is in play, they need to manually go into their router's configuration and manually forward a range of ports which would be used for FTP data connections. Then they also need to configure FlashFXP or any other FTP client to use that port range.


To save users the hassle of doing all that, server admins who are generally more savvy configure necessary things on their end and tell their clients to just use PASV mode.


Alternatively, switch to SSH/SFTP protocol which is both, encrypted and doesn't need any extra open ports to work. FlashFXP supports this as well.
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Old 03-16-2022, 10:11 PM   #2
Lansend
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Join Date: Mar 2022
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MxxCon , Thank you for your response.
As I indicated , I can connect in Active mode using the FileZilla client and Windows Explorer.
I have access to many other networks and could connect in Active mode using the FileZilla client and Windows Explorer.
Moreover I have many other servers with FTP in Active mode only and have not had any issues with FileZilla client and Windows Explorer.
Typically on routers /Firewalls , we configure outbound to be any any.
I have not had to NAT or forward port 22 to a specific IP.
It is my understanding that once an internal IP connects to an external IP ( regardless of protocol). Stickiness on the routers /Firewall kicks in and all traffic on any port is routed from that external IP address to the initiating internal IP address.

I dare say that this is some config issue in FlashXP
Will look into SSH/SFTP

Thank you
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