Please ensure you are logged in as a root user or running the Command Prompt as an Administrator to execute these scripts at the OS level.
Step 1 : Please open services.msc stop ManageEngine OpManager service
Step 2 : Open command prompt with admin rights navigate to OpManager_Home\bin directory execute the below command.
Step 6 : Ensure Mail Server Settings are configured and an email address is set for the admin user to use the “Forgot Password” option.