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    <div class="moz-cite-prefix">On 15/02/2019 06:44, TSHEPO MSIMANGO
      wrote:<br>
    </div>
    <blockquote type="cite"
cite="mid:CAAu=XZSh-kD2SuTf8jog17+tED57EjdKNf=CyD9UGphJ4hbFvQ@mail.gmail.com">
      <p style="margin:0cm 0cm
        0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span
          style="color:rgb(119,119,119)" lang="EN-US">PDNS LOGS:</span><span
          style="color:rgb(119,119,119)"><span></span></span></p>
      <p style="margin:0cm 0cm
        0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><span
          style="color:rgb(119,119,119)" lang="EN-US"> </span><span
          style="color:rgb(119,119,119)"><span></span></span></p>
      <p style="margin:0cm 0cm
        0.0001pt;font-size:11pt;font-family:"Calibri",sans-serif"><b><span
            style="color:rgb(119,119,119)" lang="EN-US">Feb 13
            11:13:16 pdns-slave pdns_server: Error trying to resolve '<a
href="https://protect-za.mimecast.com/s/0N2hCQ1X9NHopOq7IOwZUT?domain=10.200.1.12"
              style="color:blue;text-decoration:underline"
              moz-do-not-send="true">10.200.1.12:0</a>'
            for notifying '<a
href="https://protect-za.mimecast.com/s/oMJkCRgX3MH51ElNcEijaK?domain=test123.co.za"
              style="color:blue;text-decoration:underline"
              moz-do-not-send="true">test123.co.za</a>'
            to server: Unable to send notify to <a
href="https://protect-za.mimecast.com/s/nDKCCVmW35sg63KMTNoQ3S?domain=10.200.1.12"
              style="color:blue;text-decoration:underline"
              moz-do-not-send="true">10.200.1.12:53</a>
            Invalid argument</span></b></p>
    </blockquote>
    <p>Maybe you have some invalidation configuration for the zone. 
      Which backend are you using?  How did you configure the slave
      zone?</p>
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