zabbix1.softronics.ch has no CNAME records.
Question and response
Question
dig zabbix1.softronics.ch. NS
Answer
The response has no answer records.
Authority
softronics.ch. 60 SOA ns1.softronics.ch. webmaster.softronics.ch. 2026022310 10800 3600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0