Error (2927) - (Unknown error (0x803380e4)) when trying to add a Host or Cluster to System Center Virtual Machine Manager

• A possible issue with WinRM in Windows Management Framework 4.0 and lower. See the Resolution section below for details.

• Another reason is that the WinRM Trusthost policy of the SCVMM server is set to blank. The default is TrustedHosts = *. To determine the WinRm Trusthost setting, run the following command on the SCVMM server from an elevated command prompt:
  
  winrm g winrm/config
  
  Here is a snippet from a Host where the WinRM Trusthost policy is set to blank:
  
  DefaultPorts
  HTTP = 5985
  HTTPS = 5986
  TrustedHosts
  Service
  RootSDDL = O:NSG:BAD:P(A;;GA;;;BA)S:P(AU;FA;GA;;;WD)(AU;SA;GWGX;;;WD)
  
  Here is a snippet from a Host where the WinRM Trusthost policy is set to the default setting:
  
  DefaultPorts
  HTTP = 5985
  HTTPS = 5986
  TrustedHosts = *
  Service
  RootSDDL = O:NSG:BAD:P(A;;GA;;;BA)(A;;GA;;;S-1-5-21-2210657229-244641257.

• To make sure the issue is not with WinRM, install WFM 5.1. You can download the version of WMF 5.1 that applies to your operating system from https://msdn.microsoft.com/en-us/powershell/wmf/5.1/install-configure.
• To resolve issues caused by the WinRM Trusthost policy of the SCVMM server is set to blank, run the following command from an elevated command prompt with Administrative rights on the SCVMM server:

winrm set winrm/config/client @{TrustedHosts="*"}