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After P2Ving a DC dcdiag reports "name unavailable" for its own ip address

Michail Pappas 21 Reputation points
Jun 15, 2021, 6:22 AM

We are in the process of upgrading our Server 2003 R2 infrastructure to 2019. Just before trying to take the migrate path, we had to P2V the existing two DCs to ESXi, since we were afraid of the physical hardware failing.

Specifically we've offline P2V'ed srv2 having ip 192.168.1.13 (the other DC srv1 is at 192.168.1.12). DNS forwarders for this network were 172.30.47.4 and 172.30.47.5. We've run a couple of hiccups during the conversion, but essentially all went well. Replication works fine and dcdiag /test:dns /e /v as well as repadmin /replsum /bysrc /bydest /sort:Delta pass without issues.

We do have one question though. Running dcdiag shows a "name unavailable" next to the ip corresponding to srv2:

 Summary of test results for DNS servers used by the above domain controllers:

    DNS server: 192.168.1.12 (srv1.domain.local.)
       All tests passed on this DNS server
       This is a valid DNS server 
       Name resolution is funtional. _ldap._tcp SRV record for the forest root domain is registered 
       Delegation to the domain _msdcs.domain.local. is operational

    DNS server: 192.168.1.13 (<name unavailable>)
       All tests passed on this DNS server
       This is a valid DNS server 
       Name resolution is funtional. _ldap._tcp SRV record for the forest root domain is registered 

    DNS server: 172.30.47.4 (<name unavailable>)
       All tests passed on this DNS server
       This is a valid DNS server 

    DNS server: 172.30.47.5 (<name unavailable>)
       All tests passed on this DNS server
       This is a valid DNS server 

 Summary of DNS test results:

                                    Auth Basc Forw Del  Dyn  RReg Ext  
       ________________________________________________________________
    Domain: domain.local
       srv2                   PASS PASS PASS PASS PASS PASS n/a  
       srv1                        PASS PASS PASS PASS PASS PASS n/a  

 ......................... domain.local passed test DNS

Any idea on what to look for? If needed I can paste the entire dcdiag output.

Windows Server
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  1. Michail Pappas 21 Reputation points
    Jun 15, 2021, 5:27 PM

    Ok this is driving me crazy. If I interpret correctly the line "Available RID Pool for the Domain is 3106 to 1073741823" it should mean that I've not exhausted anything at all!!! Am I reading something wrong?


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