Announcement

Collapse
No announcement yet.

Dns server issues

Collapse
X
  • Filter
  • Time
  • Show
Clear All
new posts

  • Dns server issues

    I changed the ISP of my office, since then i cant contact the dns server,cant add clients to the domain, cant control users and computers on the domain..and dhcp is also not workng.
    Kindly assist to resolve this, i have been stranded for 2 weeks

  • #2
    What DNS servers?

    Where was your DHCP server?

    Comment


    • #3
      Have you changed the settings in your modem or modem/router to point to your new ISP? It won't automatically change by itself.

      Comment


      • #4
        Originally posted by wullieb1 View Post
        What DNS servers?

        Where was your DHCP server?
        Windows server 2012...it has the DNS server role and DHCP server..but non is working at the moment

        Comment


        • #5
          Originally posted by JJKing View Post
          Have you changed the settings in your modem or modem/router to point to your new ISP? It won't automatically change by itself.
          Its a fibre link and it is connected through static ip to my cisco wireless router...before the window server connects to one of the wireless router ports and other switches connect to another port on the switch.

          What setings are you refering to?

          Comment


          • #6
            Changing ISP should not affect your internal network, so something is definitely wrong - if you got a new router, check it is the correct IP and does NOT have its own DHCP server (they often do, so you suddenly get 192.168 addresses instead of the correct ones).

            If it isn't that:
            Start from the DC and confirm AD is working, Windows DNS is working (use the test option) and DHCP is authorised and running.
            Then check your DC can reach the internet (static network settings point to the new router etc) and the correct DNS forwarders are in place
            Then check DHCP is giving the correct details and work on to the clients.
            Tom Jones
            MCT, MCSE (2000:Security & 2003), MCSA:Security & Messaging, MCDBA, MCDST, MCITP(EA, EMA, SA, EDA, ES, CS), MCTS, MCP, Sec+
            PhD, MSc, FIAP, MIITT
            IT Trainer / Consultant
            Ossian Ltd
            Scotland

            ** Remember to give credit where credit is due and leave reputation points where appropriate **

            Comment


            • #7
              Originally posted by Opesy View Post

              Its a fibre link and it is connected through static ip to my cisco wireless router...before the window server connects to one of the wireless router ports and other switches connect to another port on the switch.

              What setings are you refering to?
              One line answers will not help us to help you resolve your issue. You have to describe your setup in detail or better, make a drawing of it even if you have to use MS Paint.

              If you do not understand what modem settings I am referring to then it may be a time saving idea to hire a professional IT consultant to change or check the modem settings. You will, at a minimum, have to change the credentials that you connect to the ISP with. Modem reboot may also be required. However since you mention a Cisco, it may require changing the settings by an SSH TELNET session. We don't know what you have except a Cisco wireless router (do it have the modem) and Windows 2012 Server setup in a Domain.

              To paraphrase a moderator on the site (I've been reading), my car is not working, it is a Ford. What is wrong and how can I fix it? With that information can you help me get my car working again?

              Finally, disconnect the 2012 Server from the Cisco ports and plug it into one of the switches you have. This then isolates the Domain and all the devices from the Cisco and any possible interferences. It also means, if you have Gigabit switches, that your Domain is running at Gigabit speed. If the Cisco has 100Mbps ports and you plug the Server into that then everything that needs Domain resources will be connecting at the slower speed. We are having to GUESS about this because so far all we know is that you have a Ford (sic).

              Cisco model
              Switch(s) make & model
              Network drawing with the essential devices shown and how they are connected. Visio would be best but MS Paint will suffice.

              Comment


              • #8
                Originally posted by Ossian View Post
                Changing ISP should not affect your internal network, so something is definitely wrong - if you got a new router, check it is the correct IP and does NOT have its own DHCP server (they often do, so you suddenly get 192.168 addresses instead of the correct ones).

                If it isn't that:
                Start from the DC and confirm AD is working, Windows DNS is working (use the test option) and DHCP is authorised and running.
                Then check your DC can reach the internet (static network settings point to the new router etc) and the correct DNS forwarders are in place
                Then check DHCP is giving the correct details and work on to the clients.
                this is the output i got from testing AS
                Microsoft Windows [Version 6.3.9600]
                (c) 2013 Microsoft Corporation. All rights reserved.

                C:\Users\Administrator>dcdiag /test:replications

                Directory Server Diagnosis

                Performing initial setup:
                Trying to find home server...
                Home Server = BUSINESS
                * Identified AD Forest.
                Done gathering initial info.

                Doing initial required tests

                Testing server: Default-First-Site-Name\BUSINESS
                Starting test: Connectivity
                ......................... BUSINESS passed test Connectivity

                Doing primary tests

                Testing server: Default-First-Site-Name\BUSINESS
                Starting test: Replications
                ......................... BUSINESS passed test Replications


                Running partition tests on : ForestDnsZones

                Running partition tests on : DomainDnsZones

                Running partition tests on : Schema

                Running partition tests on : Configuration

                Running partition tests on : marandmor

                Running enterprise tests on : marandmor.local


                Result from running NSLOOKUP


                C:\Users\Administrator>NSLOOKUP
                Default Server: business.marandmor.local
                Address: 192.168.1.2

                > SERVER 192.168.1.2
                Server: [192.168.1.2]
                Address: 192.168.1.2

                *** 192.168.1.2 can't find SERVER: Non-existent domain

                Result from TESTING DHCP


                C:\Users\Administrator>netsh dhcp server show server


                The current server is BUSINESS.marandmor.local with Ip Address = 192.168.1.2


                What can i be doing wrong

                Comment


                • #9
                  I really don't know because I don't know how your network should be set up.

                  Keep it simple:
                  On the DC (which OS is it)?
                  Check all AD, DNS and DHCP services are running
                  Check you can ping the router (and intermediate managed devices)
                  Check you can ping externally by IP and Name

                  If you can do all of that, AD and the DC are probably in good shape
                  Tom Jones
                  MCT, MCSE (2000:Security & 2003), MCSA:Security & Messaging, MCDBA, MCDST, MCITP(EA, EMA, SA, EDA, ES, CS), MCTS, MCP, Sec+
                  PhD, MSc, FIAP, MIITT
                  IT Trainer / Consultant
                  Ossian Ltd
                  Scotland

                  ** Remember to give credit where credit is due and leave reputation points where appropriate **

                  Comment


                  • #10
                    If this happened from the ISP change then I would suggest isolating the Domain from the Cisco. That is, unplug it so you can be sure there is zero interference coming from the Cisco. For all we know the new ISP may have provided the Cisco and it is not configured to work with an AD Domain. Once you have isolated the Domain, reboot the Domain Controller and then see what happens. Check the DHCP has not be de-authorised.
                    Check that DNS Forwarders have been changed to represent the new ISP or point them to 8.8.8.8 and 8.8.4.4 (Google). This will obviously not work while you have the Cisco disconnected.
                    You appear to have 2 issues. The ISP and Cisco config, which you seem reluctant to tell us about, and your AD possibly not working.
                    This is the second time I have asked for a drawing of your setup, there will not be a third. Remember it is you that has the problem asking the members of this site for help. You MUST provide the information for that help to be beneficial. You need to help us if we are to help you. After 2 weeks I would have brought in an outside Professional IT Consultant, in fact I would have been on this site after 2 hours offline.

                    I have seen these guys do a Scottie as in Captain Kirk, "Scottie, you're a miracle worker", once they get the network setup information that is required. (Was necessary to include since I have been referring to The Cisco from Deep Space 9 the last post or two )

                    Comment


                    • #11
                      I share you a link regarding the above topic: https://technet.microsoft.com/en-us/...(v=ws.11).aspx

                      If you are unable to solve issue, then you have to go Microsoft support center

                      Comment

                      Working...
                      X