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Block Known Ports

You can choose to block the FTP server from connecting to well-known ports.

Note: Known ports are published ports associated with services (for example, SMTP is port 25).

This provides a second layer of protection against FTP bounce attacks, by preventing such attacks from reaching well-known ports.

Block Known Ports Fields

In this field…

Do this…

Action

Specify what action to take when the FTP server attempts to connect to a well-known port, by selecting one of the following:

  • Block. Block the connection.
  • None. No action. This is the default.

See Also

FTP

FTP Bounce

Block Port Overflow

Blocked FTP Commands