FTP via FileZilla Prompts for Unknown Security Certificate

When connecting to your Managed.com hosted FTP accounts using the FileZilla FTP client, you receive a prompt regarding an Unknown SSL Certificate, as below:
AND/OR you will see the following in your connection window:
Status:	Connecting to (IP Address)...
Status:	Connection established, waiting for welcome message...
Status:	Initializing TLS...
Status:	Verifying certificate...
Status:	TLS connection established.
Status:	Connected
Status:	Retrieving directory listing...
Command:	PWD
Response:	257 "/" is current directory.
Command:	TYPE I
Response:	200 Type set to I.
Command:	PASV
Response:	227 Entering Passive Mode (IP, etc).
Command:	LIST
Response:	534 Protection level negotiation failed.
Error:	Failed to retrieve directory listing
Error:	Connection closed by server
This is due to an update in the Filezilla client ( that defaults connections to "Use explicit FTP over TLS if available". This only happens if you have your FTP connections saved in the Site Manager (File > Site Manager).
  1. Click on File > Site Manager.
  2. In the Encryption field choose Use Plain FTP.
  3. Click Connect to connect to your Managed.com hosted FTP account.

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