tektonic-cloud6.pc2linux.com has no CNAME records.
Question and response
Question
dig tektonic-cloud6.pc2linux.com. NS
Answer
The response has no answer records.
Authority
pc2linux.com. 287 SOA dns0.zoneedit.com. zone.zoneedit.com. 1760033925 2400 360 1209600 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0