You can’t uninstall / reinstall DNS from a Domain Controller so if your DNS server has insurmountable problems, make sure that you have a second DC with a working DNS then dcpromo (demote) the problematic DC, make sure DNS has been removed, then repromote that server to be a DC. Beyond that the next thing to do is restart the DNS Service which you can do through the DNS MMC console or through SERVICES.MMC .…
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