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File Transfer Protocol (FTP) is a well-established protocol for conducting file operations (such as transferring files) over a TCP-based network such as the Internet.


Telnet is an old protocol for bidirectional interactive text-oriented communication with remote hosts via virtual terminals



Telnet is more general than ftp and is generally used for command and control

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External communication in the 3 Tier Architecture

It s probably injecting telnet byte sequences into your ftp stream it often starts with trying to enable telnet s linemode which the ftp server doesn t understand;i m not really sure why people use a telnet client to interact with arbitrary text-based protocols like smtp and ftp

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FTP through Telnet: "CD FAILED!"

Ftp protocol is more complex than http or telnet form example

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How can I talk to FTP server by implementing commands over SocketConnection

Ideally the dal insulates the business entities from knowing if the data store is an rdbm ftp server webdav server nosql db or anything else;telnet is a little more difficult

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External communication in the 3 Tier Architecture

Ftp is optimized for downloading larger files where the setup overhead is amortized over the size and number of downloads http is very light-weight you can communicate to an http server using telnet much easier than ftp especially before passive ftp and is designed around html -- the concept that in the course of your navigation you will be visiting many different servers and grabbing only a couple of files at a time from each

from question  

Why does the web need HTTP?

Ftp is typically exposed since it s less risk - ssh can be much more dangerous and i would suspect blocked if you re seeing a connection timeout message;putty is an ssh telnet client not an ftp client - different protocol different tcp port

from question  

Can we login to putty with FTP details

Yes i know ftp is better than telnet but right now i m stuck with telnet

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