sys01.vadavo.com has no CNAME records.
Question and response
Question
dig sys01.vadavo.com. NS
Answer
The response has no answer records.
Authority
vadavo.com. 1800 SOA aragorn.ns.cloudflare.com. dns.cloudflare.com. 2396712866 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0