windows 2012 r2 dns resolution fails and then resolves after 2 seconds

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    Tango7
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    #166806

    Hello everyone

    My issue is that clients and the server have slow DNS resolution. They can go to a URL and it’ll have something like a dns probe error and then 2 seconds later (roughly) the page will load.

    This is Windows server standard 2012 r2 fully patched
    It is running on an HP ML350p Gen8 server with updated drivers for the NICs
    There are 4 NICs in total with only one configured. The rest are disabled.

    We have a 50 / 50 leased line currently going through a Watchguard T-70 firewall and only 10 users connected at any given time.

    The firewall is correctly configure..I’m pretty sure of that.

    DNS is setup on the server and the server is DHCP enabled

    NSLOOKUP shows the correct server name and correct IP address for the server but any lookup fails and times out after 2 seconds.
    I have forwarders configured with a forward zone named Google and then 8.8.8.8 and 8.8.4.4 used and they resolve fast first time – if I go back and check, I get an OK report but it can’t resolve the FQDN

    root hints are enabled and the simple and recursive tests pass (although recursive failed a few times before deciding to pass).

    I have a forward lookup zone for xyz.local with only 2 Host(A) records for PCs showing..the server and a single client machine
    I have another forward lookup zone xyzdomainname.com with a single Host(A) record for the MAIL entry which points to the server

    I have a reverse lookup zone which is populated with a lot of PTR records of the various computer connected to the network.

    ipconfig /all shows the dns server as the correct IP address. Everything on IPCONFIG / ALL looks fine to me but here it is below:

    C:Windowssystem32>nslookup 208.67.220.220
    Server: servername.xyz.local
    Address: 192.168.11.2

    DNS request timed out.
    timeout was 2 seconds.
    *** Request to servername.xyz.local timed-out

    C:Windowssystem32>nslookup http://www.google.co.uk
    Server: servername.xyz.local
    Address: 192.168.11.2

    DNS request timed out.
    timeout was 2 seconds.
    DNS request timed out.
    timeout was 2 seconds.
    DNS request timed out.
    timeout was 2 seconds.
    Name: http://www.google.co.uk
    Address: 2a00:1450:4009:80b::2003

    C:Windowssystem32>ipconfig /all

    Windows IP Configuration

    Host Name . . . . . . . . . . . . : SERVERNAME
    Primary Dns Suffix . . . . . . . : xyz.local
    Node Type . . . . . . . . . . . . : Hybrid
    IP Routing Enabled. . . . . . . . : No
    WINS Proxy Enabled. . . . . . . . : No
    DNS Suffix Search List. . . . . . : xyz.local

    Ethernet adapter Ethernet:

    Connection-specific DNS Suffix . :
    Description . . . . . . . . . . . : HP Ethernet 1Gb 4-port 331i Adapter
    Physical Address. . . . . . . . . : 9C-8E-99-66-CC-54
    DHCP Enabled. . . . . . . . . . . : No
    Autoconfiguration Enabled . . . . : Yes
    Link-local IPv6 Address . . . . . : fe80::179:2907:addb:79c6%12(Preferred)
    IPv4 Address. . . . . . . . . . . : 192.168.11.2(Preferred)
    Subnet Mask . . . . . . . . . . . : 255.255.255.0
    Default Gateway . . . . . . . . . : 192.168.11.1
    DHCPv6 IAID . . . . . . . . . . . : 312250009
    DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-1C-D0-18-11-9C-8E-99-66-CC-54

    DNS Servers . . . . . . . . . . . : 192.168.11.2
    NetBIOS over Tcpip. . . . . . . . : Enabled

    Tunnel adapter isatap.{A83B43F1-F90A-47F7-9538-40C6239730F0}:

    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

    So, flushdns, scavenge records etc etc has no effect but I’m sure it’s the DNS server settings somewhere.
    NIC is configured with static IP address and preferred dns server is loopback address of 127.0.0.1

    I’m sure it’s easy..I’m sure I’m missing something simple but I can’t see it.

    A magic wand please !!

    Many thanks

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