Step 1

Go to C:\Users\%USERPROFILE%\AppData\Roaming\MySQL\Workbench\ssh and empty known_hosts file

Step 2

In Workbench, go to Edit - Preferences - SSH and under the field “Path to SSH known hosts file" select the file from the above path

C:\Users\%USERPROFILE%\AppData\Roaming\MySQL\Workbench\ssh