debug SERVFAIL

[Per olof Ljungmark]

Hi,

What is the best way to debug a SERVFAIL problem? I have tried to ramp
up the trace level a lot but that did not return anything useful.

It is only one zone in question, namely the PTR for our external subnet.
What puzzles me the most is that a secondary on the same subnet answers
just fine for thesame query. All forwards zones resolves good as well.

BIND version is 9.10.4-P3

Thanks,

//per