Cannot login to JBoss ON as rhqadmin

Environment

• Red Hat JBoss Operations Network (ON) 3.3
• Below error in ON server.log:

ERROR [org.rhq.enterprise.gui.authentication.AuthenticateUserAction] (http-/0.0.0.0:7080-6) Could not log into the web application: org.rhq.enterprise.server.exception.LoginException: Cannot log in as overlord
    at org.rhq.enterprise.server.auth.SubjectManagerBean._checkAuthentication(SubjectManagerBean.java:448) [rhq-server.jar:4.12.0.JON330GA]
    at org.rhq.enterprise.server.auth.SubjectManagerBean._login(SubjectManagerBean.java:371) [rhq-server.jar:4.12.0.JON330GA]
    at org.rhq.enterprise.server.auth.SubjectManagerBean.loginLocal(SubjectManagerBean.java:362) [rhq-server.jar:4.12.0.JON330GA]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [rt.jar:1.6.0_24]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) [rt.jar:1.6.0_24]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) [rt.jar:1.6.0_24]
    at java.lang.reflect.Method.invoke(Method.java:616) [rt.jar:1.6.0_24]
    at org.jboss.as.ee.component.ManagedReferenceMethodInterceptor.processInvocation(ManagedReferenceMethodInterceptor.java:52) [jboss-as-ee-7.4.0.Final-redhat-19.jar:7.4.0.Final-redhat-19]...