The Windows SBS Sustained Engineering team at Microsoft contributed the following articles.
We have embedded both of the articles below, that you can read on-site, or at the source URLs.
The first article titled "Troubleshooting Client Deployment Issues when using Windows Small Business Server 2011, Windows Home Server 2011 and Windows Storage Server 2008 R2 Essentials" helps in providing general troubleshooting steps to take when client deployment does not succeed. Read it below:
And, the second article entitled "How to repair certificate issues in Windows Small Business Server 2011, Windows Home Server 2011 and Windows Storage Server 2008 R2 Essentials Background."
"A certificate is a critical system resource. The basic system identity functionality depends on the certificate to validate the integrity of the services and its functionalities. Users should not manually modify or remove a certificate. Each certificate has a start date and end date range. A certificate will be invalidated if the system date and time settings are changed to a time that has already passed."
This topic provides information and instructions that can help you recover a certificate that is marked as invalid or expired.