cURL IPV4 not working while ports 443 and 80 are open

I'm currently setting up a Linux VPS (Debian-based), to run a Flask app and a python script to make API calls (the API only works over IPv4, not IPv6). I'm having trouble with outgoing HTTPS connections (port 443). Here's what's happening: - Ping and traceroute to external IPs (e.g. 1.1.1.1, 142.251.40.100) work fine. - But any HTTPS request (e.g. curl https://www.google.com or openssl s_client -connect) hangs and never completes. - There are no firewall rules active (iptables -F, policies all set to ACCEPT). - There's no proxy configured (echo $http_proxy and $https_proxy return nothing). - tcpdump on the main interface shows no outgoing or incoming traffic for port 443. - nmap -Pn -p 443 shows port 443 as filtered for external servers (like Google). - Outgoing connections on other ports (e.g., ping, DNS, etc.) seem to work. I also verified the default route (ip route show) and it looks fine. The interface has a public IP, and curl or wget to HTTP or HTTPS just hangs. Reaching the Hostinger assistance, they stated: "your 443 and 80 port are opened so the network connection should be working". I have no more ideas, any tips? Thank you for your reading and help!