Port 8081 that the vRanger Hyper-V agent is connecting to, is in use by McAfee Antivirus that is running on HyperV server.
Another possible cause may be the firewall that is turned on on the Hyper-V server.
Use a different Port when establishing a connection to HyperV host from vRanger.
Port 8082 for example.
Turn off the Firewall and try to connect the Hyper-V server.
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