FAQ

What is the difference between Active and Passive FTP?

FAQ ID:    FAQ1685
Version:    1.0
Status:    Published
Published date:    10/31/2011
 

Answer

 

FTP can work in two very different modes, based on who initiates the Data connection between the Server and the Client.

1. Active mode (PORT)

 If the data connection is initiated by the Server, the FTP connection is active
Both the server and the client will be required to open up ports to listen for incoming traffic.
This can cause problems if you are behind a firewall / NAT router

2. Passive mode (PASV)

If the Client initiates the Data connection the FTP connection is passive.
Only the server is required to open up ports for incoming traffic.
Most FTP servers prefer the Passive FTP connection due to security issues.

All browsers are by default configured to work in passive mode when used as FTP clients.


 For full details on how the deploy FTP in both explicit and transparent proxy modes please see the following Knowledge Base article:

Supporting FTP on the ProxySG

 https://kb.bluecoat.com/index?page=content&id=KB2898


Rate this Page

Please take a moment to complete this form to help us better serve you.

Did this document help answer your question?
 
 
If you are finished providing feedback, please click the RATE CONTENT button. Otherwise, please add more detail in the following text box and then click RATE CONTENT.
 
 

Your response will be used to improve our document content.

Ask a Question