Websites on Plesk server are not accessible globally

Symptoms

• The website preview shows timeout error or server is unreachable.

• Websites are not accessible in a browser:

  This site can’t be reached

  Or

  ERR_CONNECTION_TIMED_OUT

• Websites are resolvable globally:

  # dig +short example.com
  203.0.113.2

• The connection on port 80 or/and 443 is filtered by firewall:

  # nmap 203.0.113.2 -p 80,443
  PORT STATE SERVICE
  80/tcp filtered http
  443/tcp filtered https

Note: in case if a site is not accessible via IPv6 check the ports using the command below:

# nmap -Pn -6 2001:db8:f61:a1ff:0:0:0:80 -p443,80

Cause

Firewall blocks connections on port 80 or/and 443.

Resolution

1. Make sure that there are no rules which prohibit connection in Plesk in Tools & Settings > Firewall.
2. If the system or a third party firewall is active on the server, made sure that it is not blocking the connection to the required port.
3. There may be an intermediate firewall between. In this case, it is required to contact the service provider.

Additional Information

• Which Ports Need To Be Opened for all Plesk Services to Work with a Firewall?