KB42994: "java.security.InvalidKeyException: invalid key format" error appears when generating the client certificate using MicroStrategy Certificate Server 9.4.1 - 10.x

SYMPTOM:
 
"java.security.InvalidKeyException: invalid key format" error appears when generating the client certificate using Strategy Certificate Server 9.3.x
 

 
CAUSE:
 
The key specified in the following location in certificateServerConfig.xml is not the correct key format. Make sure the key is in DER format.
 
   <pr n="DERPrivateKey" v="WEB-INF/CA.key" desc="The private key of the signing certificate, in DER format" />.
 
ACTION:
 
Convert the key to the DER format.