DCDIAG /test:DNS The host could not be resolved to an IP address

Hi ,

We have an issue with our Domain Controller which is used as Domain Naming Master

DCDIAG /Test:DNS is giving an error 

Doing initial required tests

   Testing server: ILO\IDEAROOT
      Starting test: Connectivity
         The host 6dd8de55-2055-4c55-aa55-18ce24d4dc55._msdcs.IDEA.ad
         could not be resolved to an IP address. Check the DNS server, DHCP,
         server name, etc.
         Got error while checking LDAP and RPC connectivity. Please check your
         firewall settings.
         ......................... IDEAROOT failed test Connectivity

Doing primary tests

   Testing server: ILO\IDEAROOT

      Starting test: DNS

         DNS Tests are running and not hung. Please wait a few minutes...
         ......................... IDEAROOT passed test DNS

   Running partition tests on : ForestDnsZones

   Running partition tests on : DomainDnsZones

   Running partition tests on : Schema

   Running partition tests on : Configuration

   Running partition tests on : IDEA

   Running enterprise tests on : idea.ad
      Starting test: DNS
         Test results for domain controllers:

            DC: IDEARoot.IDEA.ad
            Domain: IDEA.ad

TEST: Records registration (RReg)
                  Network Adapter [00000015] vmxnet3 Ethernet Adapter:
                     Warning:
                     Missing A record at DNS server 10.170.162.100:
                    IDEARoot.idea.ad

                     Error:
                     Missing SRV record at DNS server 10.170.162.100:
                     _ldap._tcp.idea.ad

                     Error:
                     Missing SRV record at DNS server 10.170.162.100:
                     _kerberos._tcp.idea.ad

                     Error:
                     Missing SRV record at DNS server 10.170.162.100:
                     _kerberos._udp.idea.ad

                     Error:
                     Missing SRV record at DNS server 10.170.162.100:
                     _kpasswd._tcp.idea.ad

                     Error:
                     Missing SRV record at DNS server 10.170.162.100:
                     _ldap._tcp.ilo._sites.idea.ad

                     Error:
                     Missing SRV record at DNS server 10.170.162.100:
                     _kerberos._tcp.ilo._sites.idea.ad

                     Error:
                     Missing SRV record at DNS server 10.170.162.100:
                     _gc._tcp.ilo._sites.idea.ad

               Error: Record registrations cannot be found for all the network
               adapters

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

            DNS server: 10.170.162.100 (IDEAROOT)
               1 test failure on this DNS server
               Name resolution is not functional. _ldap._tcp.idea.ad. faile
d on the DNS server 10.170.162.100

I checked the DNS the entry 6dd8de55-2055-4c55-aa55-18ce24d4dc55._msdcs.IDEA.ad exist .

Do you have any idea how I can resolve this issue?