I have a Windows 8 PC with two network cards installed. One is my normal card connected to a router, the other while also connected to the same router is meant exclusively for use by Hyper-V / Hyper-V guest OSes (I'm a developer and I need to test multiple OSes / browsers).
I'm using the Windows 7 Backup to do a backup to my server, and it's been failing since I installed the second NIC. I think it might be trying to use the second NIC (which shows Limited connectivity)
The backup fails because "An unexpected network error occurred." Error code is 0x8078015B
Disabling the other NIC (the one used by Hyper-V) didn't solve the problem.
The PC was running Windows 7; the backup worked properly then and for a while after upgrading to Windows 8.
The event log shows basically the same thing the Action Center does: "The backup did not complete because of an error writing to the backup location \server\clientbackup\workstation. The error is: The backup location cannot be found or is not valid. Review your backup settings and check the backup location. (0x81000006)."
What do I need to do to correct this issue so the backup completes?