Can not connect via FTP

[lkycy]

Hello friends, when i reboot the server i can not connect FTP without going to Firewall section and edit-save any port.
After i edit and save the firewall port i can connect via ftp. What is wrong with my server?

[serverliving]

Try Allowing FTP port through Vestacp panel, Are you doing it through SSH command?.

[lkycy]

FTP ports are already allowed. (20,21). This is so strange problem i dont know why but after server reboot i can not connect via ftp user but i can connect with ssh file transfer protocol (SFTP)...