Firewall term explained
Same as the firewall is a special software for secure network connections. Has the ability to restrict incoming and/or outgoing traffic on a number of conditions. Regarding SEO and web sites, a firewall blocks unwanted connections from the outside, such as connections by robots or other spam bots, increasing the load on the server.
Schematic representation of the firewall
![firewall](/firewall.jpg)
If for any implicit reasons search engines don't index the site, you may want to check the settings of the firewall or contact the server administrator.
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