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Protocol
While creating a profile, if the destination is FTP server then we have to mention what type of protocol is supported on the FTP Server.
FTP – FTP stands for "File Transfer Protocol" and it is a way to transfer files across the Internet using FTP Client program like Auto FTP Manager. It is the simplest and most secure way to exchange files over the Internet. It usually runs over TCP port 21. An FTP address looks a lot like an HTTP, or a website address except it uses the prefix ftp:// instead of http://.
FTPS - Also known as "FTP over SSL". It is an extension to the commonly used FTP that adds support for the Secure Socket Layer Protocols. FTPS should not be confused with the SSH File Transfer Protocol (SFTP), an incompatible secure file transfer subsystem for the Secure Shell (SSH) protocol. It is also different from Secure FTP, the practice of tunneling FTP through an SSH connection.
There are 3 types of settings for FTPS protocol:
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Explicit: In explicit mode, an FTPS client must "explicitly request" security from an FTPS server and then step-up to a mutually agreed encryption method. If a client does not request security, the FTPS server can either allow the client to continue insecure or refuse/limit the connection. Auto FTP Manager will first connect in plaintext, and then explicitly start SSL negotiation through a protocol command such as STARTTLS.
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Implicit: The SSL negotiation will start immediately after the connection is established.
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Auto Detect: If the remote port is set to the standard plaintext port of the protocol (where applicable), Auto FTP Manager will be set to Explicit. In all other cases, SSL negotiation will be implicit.
Note: If server protocol is FTPS and the type is unknown then select Auto Detect option.
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