In JBoss Web Server, when a PKCS#8 key generated by OpenSSL is used, JBoss Web Server displays the following error and then terminates:
incomplete client cert configured for SSL proxy (missing or encrypted private key?)
The PKCS#8 format is not supported by mod_ssl, as mod_ssl uses different functions when loading the proxy key pair.
This is a known issue in JBoss Web Server 3.0. As a workaround, convert from PKCS#8 to the raw PEM encoding of the RSA key and use "openssl pkcs8".