Local system: Fedora
Remote system: AWS AMI Linux
SSH client: putty
Problem: Putty using pem to access AWS AMI will result on error.
Error message: OpenSSH SSH-2 private key (old PEM format)
Solution: sudo puttygen pemKey.pem -o ppkKey.ppk -O private
Reference: https://www.puttygen.com/convert-pem-to-ppk
Another problem: putty cannot open the generated ppk
Error message: unable to open file
Solution ?