When you uninstall the Pulze application, files containing settings still remain in the folder %Appdata%\Pulze Service.
If you initially entered incorrect network settings (like gateway), or settings were somehow corrupted, they are saved in one of these files.
Usually, there’s no need to reinstall Windows; cleaning out %Appdata%\Pulze Service folder, relaunching Pulze, and entering the correct settings again will suffice.
Sometimes, when you have multiple network adapters, Pulze loses the correct network adapter, or it might initially fail to register the proper network adapter in the settings.
In a similar situation, аfter the initial setup of the farm, I just copied the files myDevice.json and another one (can’t remember which exactly), from a properly working node to the problematic ones, manually edited them by replacing the IP addresses, macs, network adapter names, prefered interface, etc… and then made those files read-only.