mysqli php random connect error
<p>I am receiving the below error randomly from the php backend jobs and php web page logs. Have a app server which runs php backend jobs and php webservers.  Both connect to the same database server.  Using php mysqli object oriented library for connecting to the database. Have set max connections to 750 in my.cnf. Dont see that much connections is reached.</p>
<blockquote>
<p>PHP Warning:  mysqli::mysqli(): (HY000/2003): Can't connect to MySQL server on '77.777.120.81' (99) in /usr/local/dev/classes/Admin.php on line 15</p>
<p>Failed to connect to MySQL: Can't connect to MySQL server on '77.777.120.81' (99)</p>
</blockquote>