Failed to connect to FTP Server

Hi, I can not perform updates through the WordPress dashboard , I get the error “Failed to connect to FTP Server f”

Defines some constant update wp -config.php
define (‘ FS_METHOD ‘ , ‘ FTPEXT ‘);
define (‘ FTP_BASE ‘, ‘ / path / to / wordpress / ‘);
define (‘ FTP_CONTENT_DIR ‘, ‘ / path / to / wordpress / wp -content / ‘);
define (‘ FTP_PLUGIN_DIR ‘, ‘ / path / to / wordpress / wp -content / plugins / ‘);
define (‘ FTP_HOST ‘ , ‘ https://ftp.example.org ‘);

I can guide .
Thank you