Initialization of APS instance via wizard shows the following error during client certificate verification:
unable to load client cert: -8018 (SEC_ERROR_UNKNOWN_PKCS11_ERROR)"
Both certificate and a key are provided in correct form in corresponding input fields.
Private key was provided in encrypted form while APS application requires: "Private key must be unencrypted and not protected by password."
Decrypt the key by any available means. For example,
openssl rsa -in <Encrypted key filename> -out <desired output file name>