SYMPTOM:
Users attempting to setup the Strategy Mobile Certificate Server 9.3.0 following tech note KB38391, get the following error when testing the sample URL on a browser.

Sample Code/Error
Server Error in '/<Certificate Server name>' Application.
java.lang.IllegalArgumentException: Initialization Failure: Private Key file does not exist.
CAUSE:
This error occurs because the path to the private key file of the DER type of certificate specified in the parameter "DERPrivateKey" in the certificateServerConfig.xml file is either incorrect or the private key file itself is not in *.DER format.
ACTION:
Ensure that the path specified to the parameter "DERPrivateKey" for the private key file is correct and the private key file is in the expected format: *.DER.
For more information on configuring Strategy Mobile Certificate Server, refer to tech note KB38391.