wso2 API管理器DataEndpoint无法向终结点发送事件

我使用预先打包的wso2 identity server和wso2 api manager的组合。 最近配置了一个新环境。我安装了自定义域名mylotsawso2dev.com并安装了ssl。 有时在日志中，会打印出以下错误

[2017-05-15 02:47:42,525] ERROR - DataEndpoint Unable to send events to the endpoint.
org.wso2.carbon.databridge.agent.exception.DataEndpointException: Error while trying to publish events to data receiver :mylotsawso2dev.com/30.100.209.68:9612
        at org.wso2.carbon.databridge.agent.endpoint.binary.BinaryDataEndpoint.send(BinaryDataEndpoint.java:81)
        at org.wso2.carbon.databridge.agent.endpoint.DataEndpoint$EventPublisher.publish(DataEndpoint.java:330)
        at org.wso2.carbon.databridge.agent.endpoint.DataEndpoint$EventPublisher.run(DataEndpoint.java:283)
        at java.lang.Thread.run(Thread.java:745)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at java.lang.Thread.run(Thread.java:745)
Caused by: org.wso2.carbon.databridge.commons.exception.SessionTimeoutException: 6e9a4d58-3c3b-4e59-a7ff-060322cd7d76 expired
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
        at org.wso2.carbon.databridge.agent.endpoint.binary.BinaryEventSender.processResponse(BinaryEventSender.java:164)
        at org.wso2.carbon.databridge.agent.endpoint.binary.BinaryDataEndpoint.send(BinaryDataEndpoint.java:76)
        ... 8 more

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这可能是什么原因？

这是在事件发布服务器中发生会话超时时打印的无害错误。理想情况下，这应该是一个信息日志。可以跟踪此问题