I am not sure under which forum I need to ask this question. Hopefully someone can assist here. Please see the attached pic in terms of the error we getting when trying to run the Microsoft platform ready testing tool. Exchange is fully configured, the user exists and has a mailbox. Everything for the user works when connected to the exchange server. However verifying the connection when using the Microsoft platform ready testing tool results in a problem as depicted. Do you have any advice regarding this problem? Thank You

Hi Nasier, Please use below to test the external connectivity for your exchange 2010 email system. https://www.testexchangeconnectivity.com/ Understanding it: http://technet.microsoft.com/en-us/library/ff701693.aspx Before do the tests, please make sure that you have publish the web services on the CAS server. Such as : autodisciver, ews, external web url and so on. Some information for you: http://technet.microsoft.com/en-us/library/dd351044.aspx http://technet.microsoft.com/en-us/library/aa998036.aspx http://technet.microsoft.com/en-us/library/dd351194.aspx Regards! Gavin