Never register host failed,crazy,as ca issue

Problem: register host failed,as ca issue

Expected outcome: use curl -k or --insecure or they two option together ,failed
no use option above,still failed
this make me crazy,how to do
never find solution in web
any issue with /etc/hosts file? hwo to set ip FQDN in this file
my forman install is always ok

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please provide error that you see, we can’t help you without that