SFTP backup - connection terminated by client

[CTG2020]

Hello,

3CX Hosted on a VPS with SFTP backup server on prem.

I've setup a SFTP server with access to only the /home/<username>/3CX_Backup path for a specified instance. However when setting up the SFTP details and hitting OK the window closes as it normally does and a loading bar on the top shows up and disappears and the folder is empty. On checking the log on the SFTP server the following messages are displayed:

Aug 11 09:21:44 xxxx sshd[64592]: Accepted password for <username of SFTP account> from <Public IP of 3CX instance> port 32787 ssh2
Aug 11 09:21:44 xxxx sshd[64592]: pam_unix(sshd:session): session opened for user <username of SFTP account> by (uid=0)
Aug 11 09:21:44 xxxx systemd: pam_unix(systemd-user:session): session opened for user <username of SFTP account> by (uid=0)
Aug 11 09:21:44 xxxx systemd-logind[1125]: New session 5252 of user <username of SFTP account>.
Aug 11 09:21:45 xxxx sshd[64685]: Received disconnect from <Public IP of 3CX instance> port 32787:11: Connection terminated by the client.
Aug 11 09:21:45 xxxx sshd[64592]: pam_unix(sshd:session): session closed for user <username of SFTP account>
Aug 11 09:21:45 xxxx systemd-logind[1125]: Removed session 5252.

I've tested the connection with FileZilla on an external device with the same credentials and can connect without issue.

If you could please assist, thanks!

 

[Grant Moxom]

Try connecting through filezilla from a computer you've never connected to the server from before on your mobile hotspot, see if it fails. I suspect you have authorised your private key for your computer but not the 3cx server. You'll probably need to add it to authorized_keys. Either that or a firewall issue but the error is more likely a key error

 

[CTG2020]

Thanks for your reply, interestingly the scheduled back up ran last night without issue!