manage.vps.net has no CNAME records.
Question and response
Question
dig manage.vps.net. NS
Answer
The response has no answer records.
Authority
vps.net. 900 SOA dns1.vps.net. hostmaster.vps.net. 2026030502 7200 600 1728000 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0