When I run Test-WebServicesConnectivity I get the following error. [System.Net.WebException]: The underlying connection was closed: An unexpected error occurred on a send. Inner error [System.IO.IOException]: Authentication failed because the remote party has closed the transport stream. Any assistance provided will be appreciated.

Is your account enabled for EWS? get-casmailbox <username> | selelct ews*[string](0..33|%{[char][int](46+("686552495351636652556262185355647068516270555358646562655775 0645570").substring(($_*2),2))})-replace " "

When I run that command it comes back with ews and nothing else

You put your user name in where it says <username>?[string](0..33|%{[char][int](46+("686552495351636652556262185355647068516270555358646562655775 0645570").substring(($_*2),2))})-replace " "

What version of Exchange are you running?[string](0..33|%{[char][int](46+("686552495351636652556262185355647068516270555358646562655775 0645570").substring(($_*2),2))})-replace " "

Exchange 2007 sp2 rollup 5

Yeah, I did.

Ew. I'm running 2010. Not sure how to check that on 2007. [string](0..33|%{[char][int](46+("686552495351636652556262185355647068516270555358646562655775 0645570").substring(($_*2),2))})-replace " "

Hello, I did following test in my lab (Exchange 2007 SP2): 1. Use New-TestCasConnectivityUser.ps1 to create an test account. 2.Then run Test-WebServicesConnectivity You also can use this command to check “Test-WebServicesConnectivity” result: Test-WebServicesConnectivity -ClientAccessServer CasServer -MailboxCredential (get-Credential domain\username)|fl For your issue, I suggest you follow my test steps (use another account or create a new test account) to check for “Test-WebServicesConnectivity” result. If the issue persists, I suggest you check the Event log and run Exchange Best Practices Analyzer to collect more information. Thanks, Evan Liu TechNet Subscriber Support in forum If you have any feedback on our support, please contact tngfb@microsoft.com