Rsync faild ssh key no valid

Hello, I changed the IP address of my backup server, I deleted the keys in the backup credential tab to generate a new key pair. Since then I have the following error


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)!
It is also possible that a host key has just been changed.
The fingerprint for the ED25519 key sent by the remote host is
SHA256:jP5L8VLiasszO54ky+A+OXgn4FUy6wdNM+1bQETiXo0.
Please contact your system administrator.
Add correct host key in /tmp/tmp_pz7ooge to get rid of this message.
Offending ED25519 key in /tmp/tmp_pz7ooge:3

  remove with:
  ssh-keygen -f "/tmp/tmp_pz7ooge" -R "192.168.2.28"
Host key for 192.168.2.28 has changed and you have requested strict checking.
Host key verification failed.
rsync: connection unexpectedly closed (0 bytes received so far) [sender]
rsync error: unexplained error (code 255) at io.c(231) [sender=3.2.7]

When I execute the following command in the shell, it returns this:

root@truenas[~]# ssh-keygen -f "/tmp/tmp_pz7ooge" -R "192.168.2.28"
Cannot stat /tmp/tmp_pz7ooge: No such file or directory
root@truenas[~]# 


thks for your help

in adition

have you tried?

ssh-keygen -R 192.168.2.28

yes , without success

do you have have any existing ssh keys? if not just generate a new key and then connect to 192.168.2.28