How to break HA setup:
Please stop the ADManager Plus in services.msc in the Primary and Secondary servers.
Please download the files from the attachment at the bottom of this article.
Place the RemoveHASettings.bat file in the bin folder of the installation directory (<installation Drive>\ManageEngine\ADManager Plus\bin) in the Primary server.
Place the RemoveHASettings.jar file in the lib folder of the installation directory (<installation Drive>\ManageEngine\ADManager Plus\lib) in the Primary server.
Open the command prompt as admin from the bin path <installation Drive>\ManageEngine\ADManager Plus\bin.
Execute the RemoveHASettings.bat file.
Once successfully executed, you will be shown with the line "timed out'.
After that you can start the service of ADManager Plus and check for the HA setup broke under the High Availability > Admin tab.