forge2.tierpoint.com has no CNAME records.
Question and response
Question
dig forge2.tierpoint.com. NS
Answer
The response has no answer records.
Authority
tierpoint.com. 247 SOA ns1.tierpoint.com. domains.tierpoint.com. 2017138521 10800 3600 2419200 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0