CS/IS 101 Lecture Notes - Lecture 28: Proxy Server, Post Office Protocol, Internet Message Access Protocol
Document Summary
Servers must not block incoming ports on the ports to which they listen. Every web browser is an ftp client (for download though) Robust ftp client needed to do more things than download, like make folders or upload. Ftp active mode tcp port 20 is used when server sends data back, though it is 5 times faster. Routers will block port 20 connections using port triggering. Ftp passive mode tcp port 21. Smtp simple main transfer protocol; port 25. Pop post office protocol; port 110. Simplistic, but you have to setup folder on the client itself. Stores folders in the cloud and it is synced to the client. Imap internet message access protocol; port 143. Proxy server server where you can filter data sent out, blocks websites you shouldn"t go to, provide firewalling, check for malware. You have to go to individual applications" settings to point at the proxy server. Windows can do this system-wide for browsers.
