proxmox2.boostnet.mx has no CNAME records.
Question and response
Question
dig proxmox2.boostnet.mx. NS
Answer
The response has no answer records.
Authority
boostnet.mx. 5096 SOA ns1.boostnet.mx. admin.boostnet.mx. 2026012701 3600 1800 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0