@jcfernandez Hi and welcome to the Forum 
This is a mainly English speaking forum, translation as follows….
I have just installed SUSE Linux Enterprise 15 SP7 and I cannot access the machine via FTP from Windows. I can ping it and access it via Telnet, but FTP access is denied, even though I have the firewall disabled.
I would suggest sftp instead, if not then you likely need to install vsftp and configure.