Comment 2 for bug 1467505

Claude, thank you for the report. Please provide diagnostic snapshot if possible.
Do you see any nodes as offline?

"Invalid MAC is specified" - it is from here:
https://github.com/stackforge/fuel-web/blob/3830bdcb28ec050eed399fe782cc3dd5fbf31bde/nailgun/nailgun/api/v1/validators/node.py#L204-211

It's needed to see snapshot to estimate whether this affects operation or reproduce the situation.