DNS running at 100%

DNS running at 100%

Post by Steve Duff » Fri, 29 Oct 2004 08:38:22


First try just restarting the DNS service, if you haven't
already. If you are running ISA Server also on this
machine (or SBS with ISA), audit that configuration
carefully.

There is one hotfix for Win2K3 Server I know of for this type of
issue, and there were some DNS bugs pre-SP3 on Windows 2000
Server that could cause high CPU.

But otherwise I haven't seen this problem in a very long time. You
might just try reapplying SP4 (and subsequent critical updates).

Something may simply be flooding DNS with queries. If you
disconnect from your LAN and it is still 100% then it is something
on that server (or not that at all). Crank up netmon, filter on port
53 and see what you have going on.

Steve Duff, MCSE, MVP
Ergodic Systems, Inc.
 
 
 

DNS running at 100%

Post by MMJI » Fri, 29 Oct 2004 15:41:51

Hello All,
First. Thanks to all that help others.... your knowledge is indespencible!

My Win 2K server is experiencing dns runnig at 100%
I get these errors in event viewer

Evt ID 4016
The DNS server timed out attempting an Active Directory service operation
on ---. Check Active Directory to see that it is functioning properly. The
event data contains the error.

Evt ID 9999
The DNS server has encountered numerous run-time events. These are usually
caused by the reception of bad or unexpected packets, or from problems with
or excessive replication traffic. The data is the number of suppressed
events encountered in the last 15 minute interval.

As far as I can tell AD if functioning correctly. I am not getting any AD
errors in event viewr.

Any ideas are appreciated

MMJII

 
 
 

DNS running at 100%

Post by Kevin D. G » Mon, 01 Nov 2004 01:35:08


MMJII < XXXX@XXXXX.COM > commented
Then Kevin replied below:

How many DNS servers do you have and how are they configured as for as
forwarders, primary or secondary zones, etc.?
How about the ipconfig /all ?


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DNS running at 100%

Post by MMJI » Wed, 03 Nov 2004 13:09:07

Sorry it took so long for the reply, all hell broke out with other problems.
The reboot suggestions seems to have resolved this issue. No high cpu
utilization since the reboot on the 30th.

Thanes to all for your help!
MMJII
 
 
 

DNS running at 100%

Post by Y29wYTIwMD » Thu, 02 Dec 2004 02:41:03

'm having the same problem. I have 2 servers running DNS both are win2k
w/sp4, one primary and one secondary. As of 2 days ago they were working
fine. Now if I run DNS on both of them the CPU usage hits 100 percent on both
servers. If I stop the DNS service on either system the CPU usage drops to
about 4% on both servers. I have rebooted both systems with no help. Once
they come up they run fine for 2 or 3 minutes then the CPU hits 100%. There
is nothing in the event logs to indicate any problems. The only events are
informational events not even a warning. I let the systems sit for 2 hours
thinking there may just be some bad replication going on and hoped an event
would be posted but nothing. If I let the systems stay in this state the
servers eventually run out of system resources and become unstable. The
primary DNS server is my DC and the secondary is just a file server. The only
other thing is the secondary server will spikes from 95% to 100%. The primary
stays right a 100%

There is a KB post about this but it is for sp3. I have checked the DNS.exe
version against the version list for the hot fix in the KB and my version is
newer.


"MMJII" wrote:

 
 
 

DNS running at 100%

Post by Kevin D. G » Thu, 02 Dec 2004 02:56:40


copa2000 < XXXX@XXXXX.COM > commented
Then Kevin replied below:

You would not happen to have these two DNS servers forwarding to each other
would you?
If you do, then that is most likely the problem, this sets up a DNS loop
that will cause this behavior.



--
Best regards,
Kevin D4 Dad Goodknecht Sr. [MVP]
Hope This Helps
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DNS running at 100%

Post by Y29wYTIwMD » Thu, 02 Dec 2004 03:11:01

No niether servers is forwarding to each other. There is only one thing that
changed on my network. One of my remote offices lost power and there server
(wich is another DC in AD) shutdown. But it was only down for 10 minutes.
This is the only thing that has happend since this problem. Otherwise the DNS
had been runing fine.
 
 
 

DNS running at 100%

Post by Kevin D. G » Thu, 02 Dec 2004 03:24:14


copa2000 < XXXX@XXXXX.COM > commented
Then Kevin replied below:

What are your forwarders?
Do you have any advanced logging enabled?


--
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Kevin D4 Dad Goodknecht Sr. [MVP]
Hope This Helps
===================================
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DNS running at 100%

Post by Y29wYTIwMD » Thu, 02 Dec 2004 04:03:02

My forwards are to external connections and I don't have any of the logging
on. I have one new situation. As I was playing around with this. I stopped
both services again and started them up. Now the primary server pegs to 100%
but the secondary is running fine.
 
 
 

DNS running at 100%

Post by Y29wYTIwMD » Sun, 12 Dec 2004 03:19:09

I figured out the problem. I stopped replication between my 2 servers and CPU
usage dropped to normal. I had a feeling that it was a replication issue with
the reverse lookup zones. As the primary server was the first server to peg
100% when this started I figured to start there. I deleted all of the reverse
lookup zones and then replicated them from the secondary server one by one.
After rebuilding them all CPU usage has been normal.