Issue

• Agent not starting cleanly
• The agent fails to connect to the server and the following message is logged:

        ERROR [RHQ Server Polling Thread] (enterprise.communications.command.client.JBossRemotingRemoteCommunicator)- {JBossRemotingRemoteCommunicator.init-callback-failed}The initialize callback has failed. It will be tried again. Cause: org.jboss.remoting.CannotConnectException:Can not connect http client invoker. Connection timed out. -> java.net.ConnectException:Connection timed out
        org.jboss.remoting.CannotConnectException: Can not connect http client invoker. Connection timed out.

• Agent log contains the following warning:

        WARN  [RHQ Server Polling Thread] (org.rhq.enterprise.agent.FailoverFailureCallback)- {AgentMain.too-many-failover-attempts}Too many failover attempts have been made [1]. Exception that triggered the failover: [org.jboss.remoting.CannotConnectException: Can not connect http client invoker. Connection timed out.]

• Agent can not connect to server if it is unable to resolve the server's end-point address
• I have installed JON and RHQ-Agents. All Agents were available in JON console when I had last logged in to JON. Now, all Agent appear unavailable though they are up and running