SFTP problem after switching host

[andlil]

Hello!

I decided to upgrade my self-hosted RPi web server to 64-bit Raspberry Pi OS. I run all my servers in Docker so I made a new server, copied all my Docker stuff and started everything up. Everything works as intended except one thing; SFTP upload from Meteobridge (RPi).

I have the same IP, and same file structure.

If I try "Test SFTP" on the Services /Services settings page, the test-upload file is successfully uploaded but when the scheduled SFTP event is triggered it fails with:

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2021-02-28 09:30:01 Error: 2021-02-28 09:30:00  Connection closed.    (no more tries): 
2021-02-28 09:29:00 Error: 2021-02-28 09:29:00  Connection closed.    (no more tries): 
2021-02-28 09:28:01 Error: 2021-02-28 09:28:00 Connection closed   (no more tries): 
2021-02-28 09:27:01 Error: 2021-02-28 09:27:00 Connection closed   (no more tries): 
2021-02-28 09:26:01 Error: 2021-02-28 09:26:00 Connection closed   (no more tries): 
 

If I look in /var/log/auth.log on the RPi:

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Feb 28 09:26:01 bearhallon sshd[27905]: Connection reset by 192.168.39.2 port 46496 [preauth]
Feb 28 09:27:01 bearhallon sshd[28176]: Connection reset by 192.168.39.2 port 46506 [preauth]
Feb 28 09:28:01 bearhallon sshd[28417]: Connection reset by 192.168.39.2 port 46508 [preauth]
Feb 28 09:29:00 bearhallon sshd[28684]: Connection reset by 192.168.39.2 port 46510 [preauth]
Feb 28 09:30:01 bearhallon sshd[28930]: Connection reset by 192.168.39.2 port 46512 [preauth]

Any help is appreciated!

//A

[andlil]

After eight hours of headache inducing thinking I realized that there had to be a problem with the SSH host keys, apparently my new RPi OS defaults to ssh-ed25519 which for some reason works when you push the "Test SFTP" but not for scheduled SFTP under events.

Changing /etc/ssh/sshd_config to force rsa instead of ed25519

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HostKey /etc/ssh/ssh_host_rsa_key

and restarting made everything work again.

The question is why the behavior differs between the test of SFTP and the scheduled SFTP?