Knowledgebase
20DNS 40Domains 62DotNetNuke 17Downloads 84eMail 14File Transfer Protocol 126Flash Tutorials 23General 11IIS 4Migrations 30MSSQL Server 9MySQL Server 111Parallels Plesk Panel 6Security and Hack 10SEO 23Server Settings 8SSL Certificates 1Video Tutorials 11Your Account
Knowledgebase: File Transfer Protocol
How does Active FTP work?
Posted by on 20 February 2013 06:32 PM

In active mode FTP the client connects from a random unprivileged port (port number > 1023) to the FTP server's command port, port 21. Then, the client starts listening to port N+1 and sends the FTP command PORT N+1 to the FTP server. The server will then connect back to the client's specified data port from its local data port, which is port 20.


Firewall on Active FTP - what ports should be opened on server and client side?

On server port 20 and port 21 must be opened on the client (home user) ports higher than 1023 must be opened for successfull ftp connection and transfer of files.

(0 vote(s))
Helpful
Not helpful
Comments (0)
Post a new comment
 
 
Full Name:
Email:
Comments:
CAPTCHA Verification 
 
Please enter the text you see in the image into the textbox below (we use this to prevent automated submissions).