I trying a new deployment, with PowerDNS Recursor 4.1.4
And I seem to be getting failures systematically for some records, such as
this example :

Sep 28 20:21:35 [8] mit.edu: initial validation status for mit.edu is
Indeterminate
Sep 28 20:21:35 [8] mit.edu: Cache consultations done, have 1 NS to contact
Sep 28 20:21:35 [8] mit.edu: Domain has hardcoded nameservers
Sep 28 20:21:35 [8] mit.edu: Resolved '.' NS (empty) to: 1.1.1.1, 1.0.0.1,
8.8.8.8, 8.8.4.4
Sep 28 20:21:35 [8] mit.edu: Trying IP 1.1.1.1:53, asking 'mit.edu|TXT'
Sep 28 20:21:35 [8] mit.edu: (empty) (1.1.1.1) returned a ServFail, trying
sibling IP or NS
Sep 28 20:21:35 [8] mit.edu: Trying IP 1.0.0.1:53, asking 'mit.edu|TXT'
Sep 28 20:21:35 [8] mit.edu: (empty) (1.0.0.1) returned a ServFail, trying
sibling IP or NS
Sep 28 20:21:35 [8] mit.edu: Trying IP 8.8.8.8:53, asking 'mit.edu|TXT'
Sep 28 20:21:35 [8] mit.edu: (empty) (8.8.8.8) returned a ServFail, trying
sibling IP or NS
Sep 28 20:21:35 [8] mit.edu: Trying IP 8.8.4.4:53, asking 'mit.edu|TXT'
Sep 28 20:21:35 [8] mit.edu: (empty) (8.8.4.4) returned a ServFail, trying
sibling IP or NS
Sep 28 20:21:35 [8] mit.edu: Failed to resolve via any of the 1 offered NS
at level '.'
Sep 28 20:21:35 [8] mit.edu: failed (res=-1)
Sep 28 20:21:35 2 [8/1] answer to question 'mit.edu|TXT': 0 answers, 1
additional, took 4 packets, 12.764 netw ms, 13.769 tot ms, 0 throttled, 0
timeouts, 0 tcp connections, rcode=2



Trying another record, say, mx mit.edu or txt harvard.edu or yahoo.com
works.

What could be causing such issue?

Thanks a lot,
Mohamed.
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