Are there any plans to add support for the default authentication method of the server?

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http://libvirt.org/drvhyperv.html

Authentication

In order to perform any useful operation the driver needs to log into the Hyper-V server. Therefore, only virConnectOpenAuth can be used to connect to an Hyper-V server, virConnectOpen and virConnectOpenReadOnly don't work. To log into an Hyper-V server the driver will request credentials using the callback passed to the virConnectOpenAuth function. The driver passes the hostname as challenge parameter to the callback.

Note: Currently only Basic authentication is supported by libvirt. This method is disabled by default on the Hyper-V server and can be enabled via the WinRM commandline tool.

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Regards,

Jagannath