Lock or unlock connections to control which users are allowed to
      synchronize data. Locking an application connection is an effective way to disable a specific
      user without making changes to the security profile configuration to which he or she belongs.
      Locking an application connection blocks delivery of generated data notifications to the
      replication-based synchronization clients. 
- In the left navigation pane, select theApplications node.
 
- In the right administration pane, select the Application Connections tab.
 
- Select the application connection you want to manage, and:
 - If the connection is currently unlocked and you want to disable synchronization, click Lock.
 
- If the connection is currently locked and you want to enable synchronization, click Unlock.
 
  
- In the confirmation dialog, click OK.