AX 2012 R2 Virtual Machine help server error

Hi

I have downloaded the latest AX 2012 R2 virtual machine from Partnersource. When i use the F1 (to access the help file),  I am getting an error " Unable to Connect to Server"

The help service URL which i mentioned in System administration module is 

Http://AX2012R2A:8081/DynamicsAX6HelpServer/Helpservice.svc

The host (AX 2012R2A) and Port (8081) details were collected from the IIS. 

Is this URL correct ? Please help.

Thanks in advance.