wso2 api manager :-- Wait until Qpid server starts on port - wso2

Question

While starting WSO2 API Manager with default settings and h2 database. It is unable to start. The error is below:--
TID: [-1234] [] [2018-06-18 05:44:07,794] ERROR {org.wso2.carbon.andes.internal.QpidServiceComponent} - Wait until Qpid server starts on port 5672 {org.wso2.carbon.andes.internal.QpidServiceComponent}
java.net.ConnectException: Connection refused (Connection refused)
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:204)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:589)
at java.net.Socket.connect(Socket.java:538)
at java.net.Socket.<init>(Socket.java:434)
at java.net.Socket.<init>(Socket.java:244)
at org.wso2.carbon.andes.internal.QpidServiceComponent.startAMQPServer(QpidServiceComponent.java:488)
at org.wso2.carbon.andes.internal.QpidServiceComponent.startAndesBroker(QpidServiceComponent.java:439)
at org.wso2.carbon.andes.internal.QpidServiceComponent.activate(QpidServiceComponent.java:165)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.eclipse.equinox.internal.ds.model.ServiceComponent.activate(ServiceComponent.java:260)
at org.eclipse.equinox.internal.ds.model.ServiceComponentProp.activate(ServiceComponentProp.java:146)
at org.eclipse.equinox.internal.ds.model.ServiceComponentProp.build(ServiceComponentProp.java:345)
at org.eclipse.equinox.internal.ds.InstanceProcess.buildComponent(InstanceProcess.java:620)
at org.eclipse.equinox.internal.ds.InstanceProcess.buildComponents(InstanceProcess.java:197)
at org.eclipse.equinox.internal.ds.Resolver.getEligible(Resolver.java:343)
at org.eclipse.equinox.internal.ds.SCRManager.serviceChanged(SCRManager.java:222)
at org.eclipse.osgi.internal.serviceregistry.FilteredServiceListener.serviceChanged(FilteredServiceListener.java:107)
at org.eclipse.osgi.framework.internal.core.BundleContextImpl.dispatchEvent(BundleContextImpl.java:861)
at org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:230)
Note:-- Firewald service is disabled out here.

Answer 1

First, check if any other processes are occupying 5672. (If so kill that process or offset the WSO2 ports by n.) Then, let it try connecting for 20 minutes. If not, check the CPU utilization at the time. Similar issue got resolved by increasing the number of CPU cores.

Answer 2

Try turn offing the firewall
sudo ufw disable