Site is not available: Unable to connect

Created:

2017-05-12 22:21:04 UTC

Modified:

2017-08-16 16:37:38 UTC

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Site is not available: Unable to connect

Applicable to:

  • Plesk for Linux

Symptoms

Site cannot be reached, the following error is shown in a browser:

Unable to connect

or

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

Cause

80 (or 443, if HTTPS is used) port is blocked by firewall.

Resolution

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.

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