- The website preview shows timeout error or server is unreachable.
Websites are not accessible in a browser:
This site can’t be reached
Websites are resolvable globally:
# dig +short example.com
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
Firewall blocks connections on port 80 or/and 443.
Make sure that there are no rules which prohibit connection in Plesk in Tools & Settings > Firewall.
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.
There may be an intermediate firewall between. In this case, it is required to contact the service provider.