Filezilla Error: 421 Sorry, cleartext sessions and weak ciphers are not accepted on this server

Some times we may get an error "421 Sorry, cleartext sessions and weak ciphers are not accepted on this server." while connecting to ftp server using Filezilla.

This problem can be resolved in two ways.

Method 1: Add ftpes:// as the protocol before the host name

ftpes happens to be the protocol for FTP Over Explicit TLS/SSL. So in order to get rid of the "Cleartext Sessions not allowed" error just prefix ftpes:// as the protocol before your hostname and then login with your credentials. You might receive a dialog box asking you to confirm the security certificates. Once you confirm it, you will then be able to log into the server without any error.

Method 2: Setting FTPES protocol from Servertype

The protocol for FTP Over Explicit TLS/SSL can also be speceified as an option in Filezilla. When you set your hostname and enter your credentials, you will find an option called Servertype in the same dialog box. Now select "FTPES - FTP Over Explicit TLS/SSL" from the drop down menu and then click on connect. You might receive a dialog box asking you to confirm the security certificates. Once you confirm it, you will then be able to log into the server without any error.