You can investigate cookies, if you think that is the issue, by setting
options found in the manual. There are a few options:
https://bind9.readthedocs.io/en/v9_18_9/reference.html#namedconf-statement-require-server-cookie
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The DNS server at 119.29.29.29 is broken. It does not implement EDNS (RFC 6891)
correctly. Some of the errors may be due to a misconfigured firewall in front
of
the server. This is the section of RFC 6891 the server is not following and it
is designed to allow clients to use options the server
'servfail' exception occurs after BIND runs for a period of time, restart bind
：servfail does not appear
but，After running for some time, it still had the same 'servfail' problem
#./sbin/named -VBIND 9.11.5 (Extended Support Version) running on
Linux x86_64 3.10.0-514.26.2.el7.x86_64 #1 SM
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