Perform the following steps:

1. Edit server/all/conf/jacorb.properties - set jacorb.security.support_ssl=on
2. Edit server/all/deploy/iiop-service.xml - uncomment the JaasSecurityDomain mbean and fill in valid key details then uncomment the SecurityDomain attribute and depends element of the CorbaORBService mbean.

Start up with JBOSS 5.1.0-GA:

13:31:56,207 WARN [CorbaORBService] Security domain java:/jaas/IIOP+SSL not found
13:31:56,442 INFO [SSLServerSocketFactory] Creating
13:31:56,442 WARN [SSLServerSocketFactory] Could not create DomainServerSocketFactory: java.io.IOEx
ception: The securityDomain may not be null
13:31:56,442 ERROR [AbstractKernelController] Error installing to Start: name=jboss:service=CorbaORB
state=Create mode=Manual requiredState=Installed
org.omg.CORBA.INITIALIZE: there was an invocation failure with the socket factory org.jboss.iiop.jac
orb.SSLServerSocketFactory: java.io.IOException: The securityDomain may not be
null vmcid: 0x0 minor code: 0 completed: No
at org.jacorb.orb.factory.SocketFactoryManager.newFactory(Unknown Source)

The above works successfully on JBOSS 4.2.3-GA