You can also automate that by creating a new package from the manager in the following way and pushing it across to the clients. Don't include the NTP in the new package.
1) Admin > Install Packages > Settings
2) Create a new setting which has the option of "Remove all previous logs, policies and reset the client server communication"
3) Use this setting while exporting the package.
4) Push with clientremote.exe or migration and deployment wizard
4) This will uninstall the existing clients, Reinstall them with the new configuration set.