FTP Connection

Hi Experts,

I have two questions.

1. What are setting needs to be done for the XI to establish a FTP connection outside the network.

I am aware of configuring the FTP File adapter https://www.sdn.sap.com/irj/sdn/weblogs?blog=/pub/wlg/4120. [original link is broken] [original link is broken] [original link is broken]

However usually the FTP connection outside the network encounters the firewall issues. Please can you share you inputs on this one.

2. Is it possible to establish a SFTP connection in XI.