Unauthorized: Failed to authenticate as ORGANIZATION-validator. Ensure that your node_name and client key are correct.
FATAL: Stacktrace dumped to c:/chef/cache/FATAL: Net:: HTTPServer Exception: ERROR: Failed to authenticate to https://api.opscode.com/organizations/ORGANIZATION as USERNAME with key /path/to/Response: Failed to authenticate as USERNAME.
In some cases the error message will clearly indicate a problem with another service which can be investigated further.
For non-obvious errors, please contact Chef and attach the log files. If the problematic service is a Ruby-based service and the frontend machines have free RAM or CPU, consider increasing the number of worker processes.
Server-side validation is enough to have a successful and secure form validation.
For better user experience, however, you might consider using client-side validation.
Before HTML5 there was no means of implementing validation natively; therefore, developers have resorted to a variety of Java Script based solutions.
However, the spec does provide a full DOM API, new HTML attributes, and CSS hooks authors can use to customize the experience.
You can retrieve the old certificate using the Managed Object Browser (MOB) or from the backup store.