Let's say the following is in the HPEL or SystemOut log when attempting to do something that requires authorization, such as restarting an application.

SECJ0305I: The role-based authorization check failed for admin-authz operation AdminOperations:configChanged:com.ibm.websphere.management.repository.ConfigRepositoryEvent. 

The user UNAUTHENTICATED (unique ID: unauthenticated) was not granted any of the following required roles: configurator, administrator, auditor, monitor, deployer, adminsecuritymanager, operator.

Make note of the user that lacks authorization to perform the action. In this example, the user is identified as UNAUTHENTICATED. Check the following.

• Ensure that you can sign into the WebSphere admin console with the username and password. If not, you'll first need to resolve this issue. You may need to reset the users password.
• Once you can sign into the WebSphere admin console, ensure that you are using a user account that has a role that permits the user to perform the action.
• If the user has the appropriate role, attempt to sync the node.
• If sychronization fails, check the nodeagent SystemOut.log for SECJ0373E / CWWIM0515E. If these errors are found, you may want to remove and then add the node to the dmgr.