How to create a certificate into a PKCS12 keystore with keytool?
If the keystore is PKCS12 type (.pfx) you have to specify it with -storetype PKCS12 (line breaks added for readability): keytool -genkey -alias <desired certificate alias> -keystore <path to keystore.pfx> -storetype PKCS12 -keyalg RSA -storepass <password> -validity 730 -keysize 2048