Intermittent DNS failure on windows 2003 network

Posted on 2008-11-04
Last Modified: 2012-06-21
we are having intermittent DNS failures on our windows 2003 network.

every 30 minutes or so it seems some people lose their DNS settings. what is bizarre is that even manually configured dns machines are going nutty

our dns servers are

doing "nslookup all"   reveals both DNS servers

However after a while doing "nslookup all" shows one dns server with an IP of
"results of nslookup below"

DNS reqquest timed out.
timeout was 2 seconds
can't find server name for address timed out
Default server: unknown

Running ipconfig /flushdns and /registerdns brings it back.

Now we had VMware installed on one of the DNS servers and I recently uninstalled it.

It should also be noted that the FIRST (FSMO) DNS server is a Virtual machine running on VMware and the second DNS is running on metal.

Nothing I do seems to change this.

Any ideas?
Question by:05fdml
    LVL 13

    Expert Comment

    Do you use the 192.168.11 range?
    If so, it is using the dns data from that when it does replication, and that's why you are loosing connection.
    Also, make sure that your dns records are reflecting the correct host and pointer addresses (check when the server is not responding what the dns record is showing in forward and reverse lookup zones)
    LVL 5

    Accepted Solution

    there is a big chance is an for a router on the network that has dhcp enabled and when it broadcast its  settings,  you  loose  connection
     to find  out  try this
    from  run type cmd  then type tracert
    and check on a failing machine  what ip setting it is  getting
    also  check if that  host  file of your DNS  server has that ip in it as its  own

    Author Closing Comment

    yes that was it

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