Microsoft Dynamics CRM 2011 Error: Sandbox Host - Access Denied.

Have you guys got this error in Event Viewer of Microsoft Dynamics CRM server anytime while accessing Microsoft Dynamics CRM or while performing operations on DCRM?

I recently got this error when I was trying to perform some operation and could not able to complete that operation. That was because the user I was logged into DCRM didn't have logon permission in the Local Security Policy.

Here are the steps which you have to follow to resolve the issue.

• In "Local Security Policies" added your DCRM user () under "Log-on as service".
• From elevated command prompt execute following command: "SETSPN -a MSCRMSandboxService/ \" (the required SPN was not present earlier)
• Reset CRMAppPool Application pool to restart the DCRM web-services.
• Changed the "Log On As" for "Microsoft Dynamic CRM Sandbox Processing Service" to “\”  (It should not be "Network Service". I guess by default it is Network Service).
• Re-start the service
• Add  in web.config of CRM Web Site.. this is to get more details about the problem if this is still continuing.