nsauth2.troycable.net has no CNAME records.
Question and response
Question
dig nsauth2.troycable.net. NS
Answer
The response has no answer records.
Authority
troycable.net. 10800 SOA nsauth1.troycable.net. hostmaster.troycable.net. 2021081901 43200 7200 1500000 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0