Struggles with SFTP

[chuggs]

I picked up my first Dahua, last week, the IPC-K42A purchased from EmpireTech-Andy. I have hit a roadblock with setup that I can't seem to get past--the camera will not successfully connect with my SFTP server. Here are the details of my setup:

Device Type IPC-K42A
System Version V2.800.15OG006.0.R, Build Date: 2021-07-23
WEB Version V3.2.1.17174
ONVIF Version 20.06(V2.9.0.970440)

My SFTP server is just a FreeBSD 12.3 jail running sshd. I have verified I can successfully connect and write to it from several other machines and several other SFTP clients (macos native, gftp in Arch linux). Here are the logs when I connect from one of these clients and successfully write/delete a file:

Jun  5 21:10:12 surveillance sshd[66356]: Connection from 192.168.3.101 port 57410 on 192.168.3.206 port 22
Jun  5 21:10:12 surveillance sshd[66356]: Failed publickey for surveillance from 192.168.3.101 port 57410 ssh2: RSA SHA256:WiOE2GEwRx+YDrViFBGaKxPH3TZ0r8u23T/lkuyqDRA
Jun  5 21:10:12 surveillance sshd[66356]: Postponed keyboard-interactive for surveillance from 192.168.3.101 port 57410 ssh2 [preauth]
Jun  5 21:10:12 surveillance sshd[66356]: Postponed keyboard-interactive/pam for surveillance from 192.168.3.101 port 57410 ssh2 [preauth]
Jun  5 21:10:12 surveillance sshd[66356]: Accepted keyboard-interactive/pam for surveillance from 192.168.3.101 port 57410 ssh2
Jun  5 21:10:12 surveillance sshd[66356]: User child is on pid 66359
Jun  5 21:10:12 surveillance sshd[66359]: Changed root directory to "/mnt/"
Jun  5 21:10:12 surveillance sshd[66359]: Starting session: forced-command (config) 'internal-sftp -l INFO -f AUTH' for surveillance from 192.168.3.101 port 57410 id 0
Jun  5 21:10:12 surveillance internal-sftp[66360]: session opened for local user surveillance from [192.168.3.101]
Jun  5 21:10:12 surveillance internal-sftp[66360]: opendir "/surveillance"
Jun  5 21:10:12 surveillance internal-sftp[66360]: closedir "/surveillance"
Jun  5 21:10:15 surveillance internal-sftp[66360]: open "/surveillance/update.rb" flags WRITE,CREATE,TRUNCATE mode 0666
Jun  5 21:10:15 surveillance internal-sftp[66360]: close "/surveillance/update.rb" bytes read 0 written 1416
Jun  5 21:10:17 surveillance internal-sftp[66360]: opendir "/surveillance"
Jun  5 21:10:17 surveillance internal-sftp[66360]: closedir "/surveillance"
Jun  5 21:10:31 surveillance internal-sftp[66360]: remove name "/surveillance/update.rb"
Jun  5 21:10:31 surveillance internal-sftp[66360]: opendir "/surveillance"
Jun  5 21:10:31 surveillance internal-sftp[66360]: closedir "/surveillance"
Jun  5 21:10:33 surveillance internal-sftp[66360]: session closed for local user surveillance from [192.168.3.101]
Jun  5 21:10:33 surveillance sshd[66359]: Received disconnect from 192.168.3.101 port 57410:11: disconnected by user
Jun  5 21:10:33 surveillance sshd[66359]: Disconnected from user surveillance 192.168.3.101 port 57410

However, the camera can't seem to do this. Any time it attempts to do so, in the server logs I see:

Jun  5 21:07:02 surveillance sshd[65991]: Connection from 192.168.200.3 port 52698 on 192.168.3.206 port 22
Jun  5 21:07:02 surveillance sshd[65991]: Received disconnect from 192.168.200.3 port 52698:11: Normal Shutdown, Thank you for playing [preauth]
Jun  5 21:07:02 surveillance sshd[65991]: Disconnected from authenticating user surveillance 192.168.200.3 port 52698 [preauth]

Using the "test" button in the camera only results in the cryptic error "Right verification failure".

My search for a solution hasn't turned much up. I found this discussion on a German forum, but the only proposed solution is to update the firmware. The firmware on my camera is relatively new, and I can't find anything newer. The preauth failure seems to indicate that the Dahua software is failing to initate the SSH connection correctly, but I can't seem to find any leads on how or why.

Anyone run in to this before, or is anyone successfully using SFTP from their Dahua devices?

 

[MyDaHua]

I did not succeed to connect my Dahua cameras on SFTP also, and I use FTP in LAN ( vsftpd server BSD ) for a year without any problem.

 

[MC1987]

Did you try turn Security Mode to Compatible Mode under General > Safety