DNS Check failed

[ETMARCOF]

I have standard cluster 4.0.2f and i run last version available of hypercheck and DNS check is failing. But if i SSH to every CVM's I'm able to do execute dig for every node for example dig esxi01 @ 10.21.2.230 or dig scvm01 @10.21.1.230 and so on. Why is only executing @10.21.216.230 and only testing one DNS server?

2022-02-07 05:34:13 - HX_TOOL - INFO - Executing command: stcli services dns show
2022-02-07 05:34:15 - HX_TOOL - INFO - ************************ CMD OUTPUT ************************
2022-02-07 05:34:15 - HX_TOOL - INFO - ----------------------------------------
2022-02-07 05:34:15 - HX_TOOL - INFO - 10.21.1.230
2022-02-07 05:34:15 - HX_TOOL - INFO - ----------------------------------------
2022-02-07 05:34:15 - HX_TOOL - INFO - 10.21.2.230
2022-02-07 05:34:15 - HX_TOOL - INFO - ----------------------------------------
2022-02-07 05:34:15 - HX_TOOL - INFO - *************************************************************
2022-02-07 05:34:15 - HX_TOOL - INFO - DNS IP Address: 10.21.1.230
2022-02-07 05:34:15 - HX_TOOL - INFO - DNS IP Address: 10.21.2.230
2022-02-07 05:34:15 - HX_TOOL - INFO - #############################################################
2022-02-07 05:34:15 - HX_TOOL - INFO - Executing command: dig @10.21.216.230
2022-02-07 05:34:27 - HX_TOOL - INFO - ************************ CMD OUTPUT ************************
2022-02-07 05:34:27 - HX_TOOL - INFO -
2022-02-07 05:34:27 - HX_TOOL - INFO - ; <<>> DiG 9.10.3-P4-Ubuntu <<>> @10.21.2.230
2022-02-07 05:34:27 - HX_TOOL - INFO - ; (1 server found)
2022-02-07 05:34:27 - HX_TOOL - INFO - ;; global options: +cmd
2022-02-07 05:34:27 - HX_TOOL - INFO - ;; Got answer:
2022-02-07 05:34:27 - HX_TOOL - INFO - ;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 64597
2022-02-07 05:34:27 - HX_TOOL - INFO - ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1
2022-02-07 05:34:27 - HX_TOOL - INFO -
2022-02-07 05:34:27 - HX_TOOL - INFO - ;; OPT PSEUDOSECTION:
2022-02-07 05:34:27 - HX_TOOL - INFO - ; EDNS: version: 0, flags:; udp: 4000
2022-02-07 05:34:27 - HX_TOOL - INFO - ;; QUESTION SECTION:
2022-02-07 05:34:27 - HX_TOOL - INFO - ;. IN NS
2022-02-07 05:34:27 - HX_TOOL - INFO -
2022-02-07 05:34:27 - HX_TOOL - INFO - ;; Query time: 1534 msec
2022-02-07 05:34:27 - HX_TOOL - INFO - ;; SERVER: 10.21.2.230#53(10.21.2.230)
2022-02-07 05:34:27 - HX_TOOL - INFO - ;; WHEN: Mon Feb 07 17:34:27 WET 2022
2022-02-07 05:34:27 - HX_TOOL - INFO - ;; MSG SIZE rcvd: 28
2022-02-07 05:34:27 - HX_TOOL - INFO -

[doomi]

I can confirm the issue.
the check does a simple
dig @"dns server"
which in our environment with hardened DNS servers will result in a "status: REFUSED"

the check should explicitly test for an A or PTR record, i.e.
dig @"dns server" -x "node-ip"