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

Solution 1:

"421 Sorry, cleartext sessions are not accepted on this server" means that the server is using "FTP Over Explicit TLS/SSL". This is a Good Thing.

You might be able to fix it by giving the protocol "ftpes:" instead of "ftp:":

• ftpes://ftp.somesite.com/some_folder

  ... or ...

• ftps://ftp.somesite.com/some_folder

You'll probably need to use another FTP client besides your default browser.

I don't know if newer versions of IE support FTP over SSL.

Filezilla might be a good choice:

• https://filezilla-project.org/

Solution 2:

In Filezilla.. under "File" click on the icon to open the "site manager".. then over to the right click on the "General" tab which is probably already open by default.

On the third line down where it says "Encryption".. choose "Require Explicit FTP over TLS"

That one worked fine for me.

Solution 3:

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

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

Now the 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.

Solution 4:

I was also facing the same issue and resolved after doing the following thing. If you are using filezilla as ftp client, then try this.

Host: ftpes://mydomain.com

UserName: yourUsername

Password: yourPassword

You need to just modify the Host URL. add the ftpes:// before the domain name.

Basically this issue is only coming if you are trying to access you web server from your linux(Ubuntu) machine. From windows system its working fine.