Solved :
Based on some verification, there was a firewall blocking a Quiccloud IP address.
IPSET: Set:bl_N0CBLOCK Match:XXX.XXX.252.65 Setting:N0CBLOCK file:/etc/csf/csf.blocklists
https://quic.cloud/ips
