Error establishing a database connection

Run the following after you start seeing that, and look at the output:

free -m

My bet is it looks something like this:

             total       used       free     shared    buffers     cached
Mem:          512       512        0         256        256       0
-/+ buffers/cache:       256       0
Swap:            0          0          0

If Mem and buffers/cache both show 0 free, you’re overutilizing the server, and need to move to at least a 1GB server.

You might want to verify that you’ve properly blocked requests to xmlrpc.php. You can do that with the following command:

curl -XPOST http://YOUR_DOMAIN/xmlrpc.php

if you see this, you have not blocked requests to xmlrpc.php:

<?xml version="1.0" encoding="UTF-8"?>
<methodResponse>
  <fault>
    <value>
      <struct>
        <member>
          <name>faultCode</name>
          <value><int>-32700</int></value>
        </member>
        <member>
          <name>faultString</name>
          <value><string>parse error. not well formed</string></value>
        </member>
      </struct>
    </value>
  </fault>
</methodResponse>

Problem solve with this code…

sudo start mysql

have a nice day ! embunhati