[EWS] [Exchange-Online] Http error 500 CAS server not available

We have a customer using our software to connect to outlook.office365.com via EWS. The application creates messages in the user's mailbox. We are seeing intermittent http error 500, with the fault string "Exchange Web Services are not currently available
for this request because none of the Client Access Servers in the destination site could process the request.".  The software then retries the request, and usually succeeds.  I have not seen this error with other customers, just this one. 
Why does that happen, and what can be done about it?

Hi,
As per the information and details provided by you, I think you should: -
Check the Require SSL check box under Exchange Web Services (EWS). Often, this is done under Autodiscover instead of EWS.
Perform  a reset of the Synchronize Connection and Excahnge Mailboxes (SIB) from the Edit Unified Messaging Account page.
I hope this information will be helpful for you.
Thanks and regards
Ashish@S 
Ashish@V

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         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
         at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:243)
         at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
         at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
         at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
         at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:190)
         at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
         at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
         at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
         at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2347)
         at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
         at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
         at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:170)
         at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
         at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:170)
         at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
         at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
         at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
         at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)
         at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
         at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
         at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
         at org.apache.ajp.tomcat4.Ajp13Processor.process(Ajp13Processor.java:458)
         at org.apache.ajp.tomcat4.Ajp13Processor.run(Ajp13Processor.java:551)
         at java.lang.Thread.run(Thread.java:484)
    Thanks in advance,
    Jose

    Hi,
    ClassFormatError is Thrown when the Java Virtual Machine attempts to read a class file and determines that the file is malformed or otherwise cannot be interpreted as a class file.
    So check whether you have properly configured servlet and whether class file is VALID and is in right place or not.
    Sandesh

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