Rackspace Cloud Driveclient not working

First of all, checks the logs: /var/log/driveclient.log

You might find 403 errors and lines that are showing that the agent can’t connect properly.

In this case, the first step is trying to re-register the backup agent:
3) Maybe the customer has changed the API key so try re-register the backup agent:

Desired Output:

In case you get something like “ERROR: Registration failed: Could not authenticate user. Identity returned 401“, this means that you probably need to force a bit the registration, using the following command: