I want to make use of check_by_ssh and therefor i have setup a ssh public/private key but it keeps asking for the key passphrase. Any idea how I can fix it? Or what the problem is.
My keys do work with other user account.
You need to create a key pair WITHOUT passphrase. Check google to see why it is usually considered a BAD IDEA to do so, and how to use it in a safe way.