Error: x509: certificate signed by unknown authority
Solutions
echo quit | openssl s_client -showcerts -servername server -connect vc01.xxxxxx.com:443 > /etc/pki/ca-trust/source/anchors/vc01.crt
openssl x509 -in/etc/pki/ca-trust/source/anchors/ vc01.crt -inform der -outform pem -out /etc/pki/ca-trust/source/anchors/vc01.pem
update-ca-trust force-enable
update-ca-trust extract
