So I need to access our SFTP since I have to upload an html page.

I have my manger's account(without restrictions) with me.

So I have the root password and username.

I tried using WINSCP and FZ for FTP.

I have put root as the user, the password, port 22 and the ip of our website. Both clients said i have the wrong password. Also used putty since there is an issue with SSH, also access denied. I am 100% positive of the password.

Kindly help me out.

Thanks.

If you mean FTP, most FTP servers are configured to disalllow root logins because it would be a massive security risk.

If you mean SFTP (using SSH), check /etc/ssh/sshd_config and see if PermitRootLogin is set to "yes". It is often disabled for security reasons. If you change this setting, you will need to restart the SSH service before you can log in again.

Instead of modifying /etc/ssh/sshd_config to allow password logins from root, I would recommend to use the ssh public key mechanism.