I can login to root and other ssh users using SFTP (ProFTPD) without a problem but I can't connect via sftp to any of the froxlor clients that I add via the panel though.

With some help from here, I did the following:

1. Add the following to /etc/proftpd/modules.conf
   
   LoadModule mod_sftp.c
    

2. Add the following to /etc/proftpd/sql.conf
    

   Include /etc/proftpd/sftp.conf
    

3. Create file /etc/proftpd/sftp.conf with following content:

   <IfModule mod_sftp.c>
       SFTPEngine on
       SFTPLog /var/log/proftpd/sftp.log
       SFTPHostKey /etc/ssh/sshhostdsakey
       SFTPHostKey /etc/ssh/sshhostrsakey
   </IfModule>

4. Restarted proftpd and ssh

If I try connecting via filezilla to a froxlor client with host sftp://server-ip username say, user1 and the user password, I get the following error:

Error: Authentication failed.

Error: Critical error: Could not connect to server

Please let me know if there's any info, logs, config, etc you would want me to provide.

We do not officially support this, you may want to ask the guy from the post you got this from

Oh ok, I'll do that. Thanks for the reply man!!