title: Failed to start wso2 API Manager v2.0.0 on centos 7.0
body: <p>I am trying WSO2 API Manager 2.0 and failed to start the server. Would you like give a hand? Thanks a lot Michael</p>
  
  <p>Below is the version information. </p>
  
  <pre><code>[wso2@srv11 bin]$ ./wso2server.sh --version
  
  WSO2 API Manager v2.0.0  
  WSO2 Carbon Framework v4.4.7
  </code></pre>
  
  <p>But when I start the API Manager with "wso2server.sh --start" command, I found following error information in wso2carbon.log.</p>
  
  <pre><code>ID: [-1234] [] [2016-08-15 09:48:32,824]  INFO {org.wso2.andes.server.security.auth.manager.PrincipalDatabaseAuthenticationManager} -  Initialised PLAIN SASL provider successfully {org.wso2.andes.server.security.auth.manager.PrincipalDatabaseAuthenticationManager}
  TID: [-1234] [] [2016-08-15 09:48:32,825]  INFO {org.wso2.andes.server.security.auth.manager.PrincipalDatabaseAuthenticationManager} -  Additional SASL providers successfully registered. {org.wso2.andes.server.security.auth.manager.PrincipalDatabaseAuthenticationManager}
  TID: [-1234] [] [2016-08-15 09:48:32,825]  INFO {org.wso2.andes.server.security.auth.manager.PrincipalDatabaseAuthenticationManager} -  Registering UserManagementMBean {org.wso2.andes.server.security.auth.manager.PrincipalDatabaseAuthenticationManager}
  TID: [-1] [] [2016-08-15 09:48:35,634]  WARN {java.util.prefs.FileSystemPreferences} -  Could not lock System prefs. Unix error code 32577. {java.util.prefs.FileSystemPreferences}
  TID: [-1] [] [2016-08-15 09:48:35,635]  WARN {java.util.prefs.FileSystemPreferences} -  Couldn't flush system prefs: java.util.prefs.BackingStoreException: Couldn't get file lock. {java.util.prefs.FileSystemPreferences}
  TID: [-1] [] [2016-08-15 09:48:52,850]  WARN {org.wso2.carbon.apimgt.gateway.throttling.util.KeyTemplateRetriever} -  Failed retrieving throttling data from remote endpoint: Connection refused. Retrying after 15 seconds... {org.wso2.carbon.apimgt.gateway.throttling.util.KeyTemplateRetriever}
  TID: [-1] [] [2016-08-15 09:48:52,862]  WARN {org.wso2.carbon.apimgt.gateway.throttling.util.BlockingConditionRetriever} -  Failed retrieving Blocking Conditions from remote endpoint: Connection refused. Retrying after 15 seconds... {org.wso2.carbon.apimgt.gateway.throttling.util.BlockingConditionRetriever}
  TID: [-1] [] [2016-08-15 09:48:53,073]  WARN {org.wso2.carbon.application.deployer.internal.AppDeployerServiceComponent} -  Waiting for required OSGi services: org.wso2.carbon.application.deployer.synapse.service.SynapseAppDeployerService, {org.wso2.carbon.application.deployer.internal.AppDeployerServiceComponent}
  TID: [-1] [] [2016-08-15 09:48:53,092]  WARN {org.wso2.carbon.core.internal.StartupFinalizerServiceComponent} -  Waiting for required OSGi services: org.wso2.carbon.application.deployer.service.CappDeploymentService,org.wso2.carbon.server.admin.common.IServerAdmin,org.wso2.carbon.throttling.agent.ThrottlingAgent, {org.wso2.carbon.core.internal.StartupFinalizerServiceComponent}
  TID: [-1] [] [2016-08-15 09:49:05,628]  WARN {java.util.prefs.FileSystemPreferences} -  Could not lock System prefs. Unix error code 32577. {java.util.prefs.FileSystemPreferences}
  TID: [-1] [] [2016-08-15 09:49:05,628]  WARN {java.util.prefs.FileSystemPreferences} -  Couldn't flush system prefs: java.util.prefs.BackingStoreException: Couldn't get file lock. {java.util.prefs.FileSystemPreferences}
  TID: [-1] [] [2016-08-15 09:49:07,854]  WARN {org.wso2.carbon.apimgt.gateway.throttling.util.KeyTemplateRetriever} -  Failed retrieving throttling data from remote endpoint: Connection refused. Retrying after 15 seconds... {org.wso2.carbon.apimgt.gateway.throttling.util.KeyTemplateRetriever}
  TID: [-1] [] [2016-08-15 09:49:07,865]  WARN {org.wso2.carbon.apimgt.gateway.throttling.util.BlockingConditionRetriever} -  Failed retrieving Blocking Conditions from remote endpoint: Connection refused. Retrying after 15 seconds... {org.wso2.carbon.apimgt.gateway.throttling.util.BlockingConditionRetriever}
  TID: [-1] [] [2016-08-15 09:49:24,583]  WARN {org.wso2.carbon.apimgt.gateway.throttling.util.KeyTemplateRetriever} -  Failed retrieving throttling data from remote endpoint: Connection refused. Retrying after 15 seconds... {org.wso2.carbon.apimgt.gateway.throttling.util.KeyTemplateRetriever}
  TID: [-1] [] [2016-08-15 09:49:24,593]  WARN {org.wso2.carbon.apimgt.gateway.throttling.util.BlockingConditionRetriever} -  Failed retrieving Blocking Conditions from remote endpoint: Connection refused. Retrying after 15 seconds... {org.wso2.carbon.apimgt.gateway.throttling.util.BlockingConditionRetriever}
  </code></pre>