The response received from the service didn't contain valid XML

​​​The response received from the service didn't contain valid XML: This error is generic in nature and indicates that, instead of the expected XML response (for example: SOAP web service response), we received either a) an HTML error page, or b) a truncated XML response.

Resolution:

  • Make sure the specified end user email address is correct.
  • Check to see if there is any restriction (i.e., a firewall) which could truncate XML responses larger than a certain size, or a load balancer/packet accelerator that is interacting with the network traffic.
  • Check that EWS access works:
  • ​Make sure that the Exchange servers within the environment are fully up to date with all required Service Packs and patches​​​.

  • Restart all Client Access Servers.
  • Review IIS logs and system Event logs​.

  • Check the .config file under the /EWS IIS directory. You can use a free XML validation tool, such as http://www.xmlvalidation.com.
    • Check for duplicate XML nodes.
    • Check for unclosed XML nodes.
    • Check for references to local host names not reachable from the Internet.
    • Check for httpRedirect XML nodes.
  • Recreate the EWS Virtual Directory within IIS

 

 
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