Step 1: Login to WHM.
Step 2: Under Service Configuration.
Step 3: Click Service Manager.
Step 4: Select the checkbox tailwatchd.
1. APNSPush — This driver notifies iOS® devices when new mail arrives.
2. ApacheClientsOptimizer — This driver is not currently implemented.
3. ChkServd — This driver monitors the services that you configure in the Service Manager interface.
Step 5: Click Save.