Couldnot add Host

Hi,

We have facing issue on adding Host server on SCVMM 2012 R2 . Below error occur

Error (2916)
VMM is unable to complete the request. The connection to the agent was lost.

WinRM: URL: [http://:5985], Verb: [ENUMERATE], Resource: [http://schemas.microsoft.com/wbem/wsman/1/wmi/root/virtualization/v2/Msvm_VirtualSystemManagementService], Filter: []

Unknown error (0x80338126)

Please advise ..

Regards