- Plesk for Linux
Site cannot be reached, the following error is shown in a browser:
Unable to connect
Your Internet access is blocked ERR_NETWORK_ACCESS_DENIED
Tcpdump utility shows that there is no reply from the server, but ports 80 and 443 are listening properly on the server side.
80 port is closed globally:
# nmap 203.0.113.2 -p 80
PORT STATE SERVICE
80/tcp closed http
80 (or 443, if HTTPS is used) port is blocked by firewall.
Add the following rule into iptables:
iptables -I INPUT -p tcp -m multiport --port 80,443 -j ACCEPT
If 80 is still shown as "closed", it means that it is blocked somewhere outside of the server: on a network level, or on an Internet Service Provider side. In this case, contact your network administrator or ISP.