In WordPress it requires me to provide FTP username & password, I tried both FTP & SFTP, use the server ip address instead of domain name, also changed port to 22 but none of these methods works. I wonder why I can access SFTP in Cyberduck but can't in WordPress, please help

This happens when WP is trying to update itself and does not have permission to write to the files/folders. One solution is to recursively chown the entire WP install to 'www-data:www-data', update, then chown it back to the previous owner.

-Tim

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'If debugging is the process of removing bugs, then programming must be the process of putting them in.' //Edsger Dijkstra
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It works! THX for the quick reply!