Error establishing a database connection; how can I determine whether or not these connections are real?

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http://unix.stackexchange.com – I've just run into a problem today with MySQL reaching its database connection capacity. The error I'm receiving is, Error establishing a database connection. When I try to access /phpma, I get this error instead: phpMyAdmin - Error #1040 - Too many connections. I've looked up how to change my.cnf to increase the number of connections, but I think I've already done this a while back and had no issues since. I'm therefore a little worried that these connections are some kind of vulnerability. I'm running CentOS, but I'm a linux noob. Is there any easy way of checking these connections? Is th (HowTos)