gdns2.dstsystems.com has no CNAME records.
Question and response
Question
dig gdns2.dstsystems.com. NS
Answer
The response has no answer records.
Authority
dstsystems.com. 1308 SOA inetdns1.ssnc.cloud. dns.cloudflare.com. 2396664716 10000 2400 604800 5400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0