Restarting changes host identification?

[Yenkaykay]

I have Alt F on a DNS 323(with dropbear for SSH).

ssh into DNS 323 (without keys) work fine after copying the public key from a PI. 

Once the DNS 323 is restarted, I can't do scp and get the below error : 

----------------------------------------------------

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@

@    WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!     @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
Someone could be eavesdropping on you right now (man-in-the-middle attack)! ......

------------------------------------------------------

What I mean is everytime I restart the DNS 323, I have to do ssh-keygen and ssh-copy-id from the server which connects to the DNS 323. 

Is it a problem with Dropbear or something to do with ALT-F ?

[João Cardoso]

Are you doing the scp to a normal Alt-F user or to the root user?

Under Alt-F the root user home folder, '/root' is in RAM memory, is volatile, so the user keys will be lost upon a reboot, while a normal user keys are on disk, persistent. For the root user you will need to use the "user boot" script Services->User,user,Configure, and edit the "Script to execute on powerup:"; e.g., after the 'start)' line I add 'cp -a /mnt/sda4/.ssh /root'.

The host id keys are also stored on RAM memory, so you have to "save settings" to store them in flash memory; on reboot the flash memory saved settings are copied to the right place, but if "settings" don't exists on flash new host keys are generated.

A red warning "When done you must save settings " appears in the webUI whenever any flash saved files are changed; keep the mouse still on the warning to see what files have changed, and click the warning to go to the "save settings" webUI page.

[Kiruthik Kumar]

thank you! I'm using scp with the root user. I will change it to a different user then! Thanks again!! 

On Sun, Sep 22, 2019 at 2:24 PM João Cardoso <whoami...@gmail.com> wrote:

On Wednesday, 18 September 2019 15:56:09 UTC+1, Yenkaykay wrote:

I have Alt F on a DNS 323(with dropbear for SSH).

ssh into DNS 323 (without keys) work fine after copying the public key from a PI. 

Once the DNS 323 is restarted, I can't do scp and get the below error : 

----------------------------------------------------

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@

@    WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!     @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
Someone could be eavesdropping on you right now (man-in-the-middle attack)! ......

------------------------------------------------------

What I mean is everytime I restart the DNS 323, I have to do ssh-keygen and ssh-copy-id from the server which connects to the DNS 323. 

Is it a problem with Dropbear or something to do with ALT-F ?

Are you doing the scp to a normal Alt-F user or to the root user?

Under Alt-F the root user home folder, '/root' is in RAM memory, is volatile, so the user keys will be lost upon a reboot, while a normal user keys are on disk, persistent. For the root user you will need to use the "user boot" script Services->User,user,Configure, and edit the "Script to execute on powerup:"; e.g., after the 'start)' line I add 'cp -a /mnt/sda4/.ssh /root'.

The host id keys are also stored on RAM memory, so you have to "save settings" to store them in flash memory; on reboot the flash memory saved settings are copied to the right place, but if "settings" don't exists on flash new host keys are generated.

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- Regards,

KK