No, I dont have any FQDN set up. I always connect by IP and always connect only from the same local subnet. And when you set FQDN for some server and DNS server goes down, then usually no any server starts shutting down its services. And why the IP address must change after restart? I dont have any local FQDN registered in my DNS server for vmware products. Never was, altough I used vCenter about 10y now, beginning from version 4. But now was the first time I see it shuts down its own services. It was never doed this before. I have he newest 6.7 vCenter, with all updates. No, vCenter had not such requirements. The only software, I remember, that wanted also reverse PTR was vSphere Data Protection. This is fact - 1) I dont have FQDN set in DNS 2) I still use vCenter successfully. So, how I can use it then when exist such requirements?.