FileZilla Server You have to use FTP over TLS”, you can check the message when you use “530 This server does not allow plain FTP.
The message is: 530 This server does not allow plain FTP. You have to use FTP over TLS

Solution:
Click EDit –> Settings –> FTP over TLS setting, uncheck **Enable FTP over TLS support(FTPS)** and it will be OK (so that the encryption method does not use explicit FTP over TLS)