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DNS Zone Tranfer

Posted on 2009-03-31
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Medium Priority
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Last Modified: 2012-05-06
Hi Experts

My Event Viewer / DNS Server Log keeps saying :
Source:  DNS
Event ID: 6527
Zone xxx.com has expired before it could obtain a successful zone transfer or update from a master server acting as its source for the zone. The zone has been shut down.

But zone transfers from Primary to Secondary are happening fine.
Then why do i get the above error message???.   :-(
Pls help.

Thanks & Regards
--Ali
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Question by:aliomarb
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6 Comments
 
LVL 71

Expert Comment

by:Chris Dent
ID: 24030525

Has it actually Expired? What is the Expiry set to?

Chris
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Author Comment

by:aliomarb
ID: 24030633
Hi Chris

I was just googling on the net.
In the SOA Tab, the Expiry was set to 1 minute.
I just changed that to 1 hour. (I think this is recommended)  right !!???
Please advise...

Regards
--Ali
0
 
LVL 71

Expert Comment

by:Chris Dent
ID: 24030718

Depends on how you're using it. I'll happily use anything from 1 hour to a month. If it's more important to maintain access to the zone I'd set the value to least 8 hours.

Chris
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Author Comment

by:aliomarb
ID: 24030739
But what does this setting actually mean or do ??
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LVL 71

Accepted Solution

by:
Chris Dent earned 1500 total points
ID: 24030811

It says how long the Secondary server should hold onto the zone before it's considered invalid and has to be discarded. Normally that only applies when zone transfer requests fail continually (because normally the Expiry is quite long).

However, with it set to 1 minute the Secondary server would have been discarding the zone if it didn't successfully Transfer from the Primary during within a minute of the last transfer.

Expiry works with the Refresh interval in the SOA which states how often the Secondary should check in with the Primary for an update. If the Refresh is greater than the Expiry the zone will be discarded as invalid long before it has a chance to attempt to transfer again.

Chris
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Author Closing Comment

by:aliomarb
ID: 31564890
great
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