QDNS server freeze

Re: QDNS server freeze

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We too have had this exact problem (BW G3, EIMS, MacRadius). We had one of
our own Windows NT servers that was set to do a zone transfer and regardless
as to wether we allowed it or not it would crash on QDNS servers. That
saver was upgraded to Win2k and the problem went away. I have also had some
unix box's try and do zone transfers when not allowed and would cause QDNS
lockups.

My gut feeling it that it may be some type of malformed zone transfer
request that causes the freeze. I must add that our dns servers have been
quite stable for the last 6 months.... But when they do start freezing it
is the same pattern as you described.

> When our File server, (BW G3 400, ASIP 6.32) which also runs a printer
> server , QDNS and a couple of other items, began freezing recently after a
> number of months of extremely stable operation I was pretty surprised. I
> began to isolate the problem which was initially occurring only about once
> every 24-36 hours. The frequency of the freezing began to increase (which
> was bad but also enabled me to isolate the problem more rapidly) until at
> the end it was happening about once every 45 minutes. It took me about 10
> days to isolate the problem to QDNS 2.21, when I left this turned off the
> server ran fine without any problems. At this point I thought, well these
> things happen and set about trying to figure what would solve the problem,
> ie reinstall, rebuild etc. As I was examining the log file however some
> potential clues began to make their presence known. About the time of the
> first freeze in late June we started to get a Zone Transfer request from an
> IP # that wasn't allowed. As I scanned the log I realized that a freeze
> always occurred a few minutes after this Zone Transfer request was denied.
> The IP # of this computer was so close to that of the two numbers belonging
> to our webhost that it was obvious that it was a computer belonging to them
> making this request. As time went along and it wasn't allowed to be updated
> it began making it's request with more and more frequency, causing our crash
> with more and more frequency. It turns out that our web host had put in a
> new DNS server, moving the old one to backup status, but failed to correctly
> configure it for back use and it continued to make Zone transfer requests.
> Our webhost fixed the problem as I set QDNS to allow Zone transfer requests
> from this IP (just to be safe until I was sure the change had been made) and
> the freezing problem went away.
>
> I'm not sure if the freezing was inevitable with this kind of problem or if
> there is something that can be done to QDNS to avoid a catastrophic failure
> if it does occur.
>
> Thanks,
>
> Dave
>
> David R. Cooper

______________________________________________
Greg Saulsbury
Custom Technology
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