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Hi Luci, thank you for your answer! We ended up fixing the issue by setting up a separate migration network, and it is working right now. I'll give you a heads up if we hit this issue again.

Thanks Domi

~~Hi Luci, thank you~~ Thanks for ~~your answer! We ended up fixing~~ Luci for helping us with this issue, so for future reference the ~~issue by setting up a separate migration network, and it is working right now. I'll give you a heads up if we hit this issue again.~~final fix was then the following:

~~Thanks Domi~~

Set up a migration network

Set up SMB constrained delegation (it might not has a direct connection with the issue, but it's good to have it): http://www.thomasmaurer.ch/2014/02/hyper-v-over-smb-set-smb-constrained-delegation-via-powershell/

Applying Luci's patch: Downstream Cinder Liberty patch: https://github.com/cloudbase/cinder/commit/c57b85ea06d899f2a6d5fb6ecc37f0da3b6fca6b os-win patch: https://review.openstack.org/#/c/280640/