FTP & SFTP doesnt work on new installation


I installed a fresh virtualmin on my VPS, but I can’t connect to FTP or SFTP. I’ve uninstalled proftdp multiple times and reinstalled it, but the connection timeout continues.
I don’t think its my firewall cause I can connect to another VPS which running a centos installation. The VPS that cause the error has a Debian 8 system.