Should you experience difficulty logging into FTP then you can regenerate all FTP account logins.
First you should check if the service is running and if there are any network issues, the below common issues and resolutions might also be helpful before completing this step:
If there are no networking issues and the service is running but the FTP login username and password is still not working.
We recommend you try to regenerate all FTP account logins using the following command in SSH:
/root/init beta --reset-ftp