Warning: mysqli_real_connect(): php_network_getaddresses: getaddrinfo for db failed: Temporary failure in name resolution in /var/www/html/sites/plombier-laval.com/public_html/wp-includes/class-wpdb.php on line 2035

Warning: mysqli_real_connect(): (HY000/2002): php_network_getaddresses: getaddrinfo for db failed: Temporary failure in name resolution in /var/www/html/sites/plombier-laval.com/public_html/wp-includes/class-wpdb.php on line 2035
<error>
    <code>wp_die</code>
    <title><![CDATA[WordPress &amp;rsaquo; Error]]></title>
    <message><![CDATA[&lt;p&gt;&lt;code&gt;php_network_getaddresses: getaddrinfo for db failed: Temporary failure in name resolution&lt;/code&gt;&lt;/p&gt;
&lt;h1&gt;Error establishing a database connection&lt;/h1&gt;
&lt;p&gt;This either means that the username and password information in your &lt;code&gt;wp-config.php&lt;/code&gt; file is incorrect or that contact with the database server at &lt;code&gt;db&lt;/code&gt; could not be established. This could mean your host&amp;#8217;s database server is down.&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;Are you sure you have the correct username and password?&lt;/li&gt;
&lt;li&gt;Are you sure you have typed the correct hostname?&lt;/li&gt;
&lt;li&gt;Are you sure the database server is running?&lt;/li&gt;
&lt;/ul&gt;
&lt;p&gt;If you are unsure what these terms mean you should probably contact your host. If you still need help you can always visit the &lt;a href=&quot;https://wordpress.org/support/forums/&quot;&gt;WordPress support forums&lt;/a&gt;.&lt;/p&gt;
]]></message>
    <data>
        <status>500</status>
    </data>
</error>