gdns1.dstsystems.com has no CNAME records.
Question and response
Question
dig gdns1.dstsystems.com. NS
Answer
The response has no answer records.
Authority
dstsystems.com. 3496 SOA inetdns1.ssnc.cloud. dns.cloudflare.com. 2397573931 10000 2400 604800 5400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0