disableing EDNS messages bind-9.5.0

[Dean Clapper]

I'm trying to troubleshoot why we are getting a lot of disabling EDNS 
messages in /var/log/messages.

We are running bind-9.5.0.P2 on a linux box.

Jan 27 11:42:23 ns0 named[27764]: too many timeouts resolving 
'host2.centmine.com/AAAA' (in 'centmine.com'?): disabling EDNS
Jan 27 11:42:24 ns0 named[27764]: too many timeouts resolving 
'host1.centmine.com/AAAA' (in 'centmine.com'?): disabling EDNS
Jan 27 11:42:38 ns0 named[27764]: too many timeouts resolving 
'pts1.abovecow.com/AAAA' (in 'abovecow.com'?): disabling EDNS
Jan 27 11:42:38 ns0 named[27764]: too many timeouts resolving 
'pts2.abovecow.com/AAAA' (in 'abovecow.com'?): disabling EDNS
...
Jan 27 11:43:39 ns0 named[27764]: too many timeouts resolving 
'196.198.117.216.zen.spamhaus.org/A' (in 'zen.spamhaus.org'?): disabling 
EDNS

I started receiving these messages after updating from 9.4 -> 9.5.  I've 
found a couple places to test packet sizes, but have not had any problem.  
The messages about zen.spamhaus.org leads me to possibly email related 
issues. 

Thanks
Dean 
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