421 Sorry, cleartext sessions are not accepted on this server. – FileZilla Error

Some times when you connect to the webhost via FileZilla you may encounter this error message.
“421 Sorry, cleartext sessions are not accepted on this server.”

Solution:
Just add a ftpes:// before the domain name

Old One,
host : domain.com
username : xxx
pass : yyy
port : 21

New,
host : ftpes://domain.com
username : xxx
pass : yyy
port : 21

Advanced Option,

Login to Web Host Manager
Go To : Service Configuration
Go To : FTP Server Configuration
Check that :
TLS Encryption Support : set to “Optional”

Try that, it will work.