I know this might seem a duplicate but wait!
We have a Windows Server 2012 R2 domain controller, it obviously is a DNS server which hosts one AD-integrated domain. recently, it stopped responding and receiving DNS data a couple of days ago, for an unknown reason. It cannot resolve domain names and cannot reverse-lookup an IP, it means it cannot access root hints, forwarders, other websites and ...
All internet resources are accessible by IP and I can ping root hints and forwarders using their IP addresses.
I've already tried: setting up reverse lookup zones, disabling firewall, disabling IPv6, disabling EDNS0, shutting RRAS down, using an external DNS, rebooting, disallowing suffix appending...
I have no clue about what's going on, until when the RRAS service was active, I could dial the server and resolve all internal FQDNs, but not an external one. This server has one IP address which is completely accessible remotely.
I hope you can help.
UPDATE: ARP TEST
Interface: 87.236.214.XXX --- 0xc
Internet Address Physical Address Type
87.236.214.254 64-64-9b-30-20-81 dynamic
87.236.214.255 ff-ff-ff-ff-ff-ff static
224.0.0.22 01-00-5e-00-00-16 static
224.0.0.252 01-00-5e-00-00-fc static
224.0.1.24 01-00-5e-00-01-18 static
UPDATE: IPCONFIG
Windows IP Configuration
Host Name . . . . . . . . . . . . : CFS
Primary Dns Suffix . . . . . . . : somedomain.co.uk
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No
DNS Suffix Search List. . . . . . : somedomain.co.uk
Ethernet adapter Local Area Connection:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : TAP-Windows Adapter V9 #2
Physical Address. . . . . . . . . : 00-FF-C2-28-3C-93
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Ethernet adapter Ethernet 2:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : TAP-Windows Adapter V9
Physical Address. . . . . . . . . : 00-FF-C7-1E-C3-2A
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Ethernet adapter Ethernet:
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Intel(R) 82574L Gigabit Network Connectio
n
Physical Address. . . . . . . . . : 00-50-56-88-B4-CB
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::65fa:4976:4508:552d%12(Preferred)
IPv4 Address. . . . . . . . . . . : 87.236.214.XXX(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 87.236.214.254
DHCPv6 IAID . . . . . . . . . . . : 302010454
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-1C-C8-30-F4-00-50-56-88-B4-CB
DNS Servers . . . . . . . . . . . : 127.0.0.1
NetBIOS over Tcpip. . . . . . . . : Disabled
Tunnel adapter isatap.{A05CB42A-B4DE-4675-B1AB-2FF643A39C8F}:
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft ISATAP Adapter
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::200:5efe:87.236.214.163%30(Preferre
d)
Default Gateway . . . . . . . . . :
DHCPv6 IAID . . . . . . . . . . . : 503316480
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-1C-C8-30-F4-00-50-56-88-B4-CB
DNS Servers . . . . . . . . . . . : 127.0.0.1
NetBIOS over Tcpip. . . . . . . . : Disabled
Tunnel adapter isatap.{C71EC32A-4699-4F87-898D-82BB58445CB5}:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft ISATAP Adapter #2
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
Tunnel adapter 6TO4_Adapter:
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft 6to4 Adapter
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
IPv6 Address. . . . . . . . . . . : 2002:57ec:d6a3::57ec:d6a3(Preferred)
Default Gateway . . . . . . . . . :
DHCPv6 IAID . . . . . . . . . . . : 536870912
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-1C-C8-30-F4-00-50-56-88-B4-CB
DNS Servers . . . . . . . . . . . : 127.0.0.1
NetBIOS over Tcpip. . . . . . . . : Disabled
Tunnel adapter isatap.{C2283C93-6E5F-433C-9775-AA9E9B54F989}:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft ISATAP Adapter #3
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
I've already tried: setting up reverse lookup zones, disabling firewall, disabling IPv6, disabling EDNS0, shutting RRAS down, using an external DNS, rebooting, disallowing suffix appending
- So this is just a bunch of random stuff that you tried in the hopes that something would fix the problem? How about trying some good old troubleshooting instead? Run nslookup from a client and the server, run a packet capture from a client and the server, run the tests on the Monitoring tab of the DNS server properties, etc., etc.