Error Code 600 Autodiscover

I am using Exchange server 2007 i am facing issue activesync,
my users are not able to emails from their smartphones


https://autodiscover.mydomain.com/autodiscover/autodiscover.xml
<?xml version="1.0" encoding="utf-8" ?> 
- <Autodiscover xmlns="http://schemas.microsoft.com/exchange/autodiscover/responseschema/2006">
- <Response>
- <Error Time="12:31:17.3655146" Id="2053059689">
  <ErrorCode>600</ErrorCode> 
  <Message>Invalid Request</Message> 
  <DebugData /> 
  </Error>
  </Response>
  </Autodiscover>

https://mail.mydomain.com/autodiscover/autodiscover.xml
 <?xml version="1.0" encoding="utf-8" ?> 
- <Autodiscover xmlns="http://schemas.microsoft.com/exchange/autodiscover/responseschema/2006">
- <Response>
- <Error Time="12:31:19.5627343" Id="2053059689">
  <ErrorCode>600</ErrorCode> 
  <Message>Invalid Request</Message> 
  <DebugData /> 
  </Error>
  </Response>
  </Autodiscover>




[PS] C:\Users\Administrator.Mydomain\Desktop>Test-OutlookWebServices | fl


Id      : 1003
Type    : Information
Message : About to test AutoDiscover with the e-mail address Administrator@mydomain.

Id      : 1007
Type    : Information
Message : Testing server MAIL.mydomain with the published name https://mail.mydomain/EWS/Exchange.asmx & .

Id      : 1019
Type    : Information
Message : Found a valid AutoDiscover service connection point. The AutoDiscover URL on this object is https://mail.mydomain/autodiscover/autodiscover.xml.

Id      : 1006
Type    : Information
Message : The Autodiscover service was contacted at https://mail.mydomain/autodiscover/autodiscover.xml.

Id      : 1016
Type    : Success
Message : [EXCH]-Successfully contacted the AS service at https://mail.mydomain/EWS/Exchange.asmx. The elapsed time was 609 milliseconds.

Id      : 1015
Type    : Information
Message : [EXCH]-The OAB is not configured for this user.

Id      : 1014
Type    : Success
Message : [EXCH]-Successfully contacted the UM service at https://mail.mydomain/UnifiedMessaging/Service.asmx. The elapsed time was 181 milliseconds.

Id      : 1016
Type    : Information
Message : [EXPR]-The AS is not configured for this user.

Id      : 1015
Type    : Information
Message : [EXPR]-The OAB is not configured for this user.

Id      : 1014
Type    : Information
Message : [EXPR]-The UM is not configured for this user.

Id      : 1017
Type    : Success
Message : [EXPR]-Successfully contacted the RPC/HTTP service at https://mail.mydomain/Rpc. The elapsed time was 16 milliseconds.

Id      : 1006
Type    : Success
Message : The Autodiscover service was tested successfully.