Unable to access EBS R12 from AppsLogin page under the following URL

On 12.0.0 in Production:
Unable to access EBS R12 from AppsLogin page under the following URL :
http://domain:8000/OA_HTML/AppsLogin

ERROR
Unable to generate forwarding URL. Exception: java.lang.IllegalArgumentException:
WebAppsContext.getJDBCConnection() == null

Solution
1.Run AutoConfig as described in Note 387859.1 Using AutoConfig to Manage System Configurations with Oracle E-Business Suite Release 12

2.Restart the eBusiness middle tier services

3.Re-test the issue to confirm the problem is now resolved