The packer build needs to know to use port 55985 for WinRM since virtualbox is forwarding 127.0.0.1:55895 to the guest VM on port 5985.
Guest additions need to be installed as per https://www.virtualbox.org/manual/ch04.html. Certificates need to be installed using VBoxCertUtil before running VBoxWindowsAdditions.exe /S
The packer build needs to know to use port 55985 for WinRM since virtualbox is forwarding 127.0.0.1:55895 to the guest VM on port 5985.
Guest additions need to be installed as per https://www.virtualbox.org/manual/ch04.html. Certificates need to be installed using VBoxCertUtil before running VBoxWindowsAdditions.exe /S