Certain versions of mono came with an empty certificate store - perhaps yours is empty or stale?
cert-sync /etc/ssl/certs/ca-certificates.crt
#for Debian based systems -cert-sync /etc/pki/tls/certs/ca-bundle.crt
#for RedHat derivatives
Certain versions of mono came with an empty certificate store - perhaps yours is empty or stale?
cert-sync /etc/ssl/certs/ca-certificates.crt
#for Debian based systems - cert-sync /etc/pki/tls/certs/ca-bundle.crt
#for RedHat derivatives