query failed (broken trust chain)

[Manish Rane]

Hi Team,

Any clue why this? and I my BIND has stopped resolving

07-Jul-2021 15:59:34.588 client @0x7f1c50b7ea88 192.168.10.174#56213 (
cisco.com): query failed (broken trust chain) for cisco.com/IN/A at
query.c:7376
07-Jul-2021 15:59:34.844 client @0x7f1c5d9135a8 192.168.10.174#56214 (
cisco.com): query failed (broken trust chain) for cisco.com/IN/AAAA at
query.c:73

BIND 9.16.18-Ubuntu (Stable Release) <id:1c027c4

        directory "/var/cache/bind";
        recursion yes;
        querylog yes;
        forwarders {
               1.1.1.1;9.9.9.9;208.67.222.222;8.8.8.8;
                  };
//      dnssec-validation auto;
        request-ixfr yes;
        auth-nxdomain no;    # conform to RFC1035
//      listen-on-v6 { any; };
        listen-on port 53 { any; };

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Thanks and Regards,
Manish R
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