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SSH-Connection “Permission denied” after change of IP-Addresses

a couple of hours ago I changed the IP-Address of my Windows-PC and my Raspberry Pi. Up until then I was able to connect to the Pi via SSH without any problems. Now, when I try to connect, I get the error message, that someone is trying “something nasty” and that I should contact my Network Administrator.

So I made a backup of my “known-hosts” file and created an empty one. When I connect now via SSH through Windows-Terminal I get the following Output:

Output

I have no idea what this is supposed to tell me, nor what should I do. I already flashed the Pi, yet to no avail. No matter if I reset the network-configuration of my PC or the Pi or both in the router config, the error-messages remain the same.