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Cinder local loopback

I am using cinder AZs to expose local disk for volume services running on a Hyper-V 2016 instance. Using the mitaka cinder driver it can do the local detect (for S2D efficiency) which works most of the time. But after a while I will start getting what I would imagine is a token expiration that breaks attaching volumes to instances.

2017-03-31 13:07:02.532 3436 ERROR cinder.volume.drivers.remotefs [req-9695f713-81a8-4b0e-b04f-1b9d26f9bf2e - - - - -] Exception during mounting Unable to mount SMBFS share: \localhost\Cinder$ WMI exception: <x_wmi: a="" specified="" logon="" session="" does="" not="" exist.="" it="" may="" already="" have="" been="" terminated.="" &gt;<="" p="">

I am betting I just need to do a more precise configuration in my New-SmbShare with perms or something, but wasn't sure. And HV server is a bit of a black box so harder to track down might might be going on. As a note volume creation and nova ops all work, but that attachment is what is blowing up.