Chain INPUT (policy DROP)
Temporarily disable the firewall to confirm the issue (do not do this in production). inbound traffic blocked, check firewall settings
If problems persist, check for conflicting VPNs, proxy settings, or SELinux (Linux) which can also deny network access independently of the firewall. Chain INPUT (policy DROP) Temporarily disable the firewall
sudo ufw status verbose If inactive, enable it with sudo ufw enable . If active, check for rules like Deny from any or missing Allow rules for your port. check for conflicting VPNs
sudo iptables -L -n -v Look for a default policy of DROP or REJECT on the INPUT chain. Example blocking line: