On Fri, 2018-01-19 at 15:22 +0000, Tony Finch wrote: > > You don't have any weird middleboxes between your resolver and the > Internet, do you?
I don't believe so. Not entirely sure what "weird middleboxes" refers to in this context though. And by resolver are you referring to my BIND9 server or the resolvers on the clients of that server? I've added packet capturing to the debug collection so that I can see what my BIND9 server is sending and receiving in the way of queries and responses when this happens again. Cheers, b.
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