title: Percona Xtrabackup fails during backup
body: <p>When i try to perform a backup using Percona innobackupex, i get the following error:</p>
  
  <pre><code> george@db-pxc-1 [~] [17:50] sudo innobackupex --user=root  --password=secret --host=127.0.0.1  ~/Data
  160830 17:50:34 innobackupex: Starting the backup operation
  
  IMPORTANT: Please check that the backup run completes successfully.
             At the end of a successful backup run innobackupex
             prints "completed OK!".
  
  160830 17:50:35  version_check Connecting to MySQL server with DSN 'dbi:mysql:;mysql_read_default_group=xtrabackup;host=127.0.0.1;port=3306' as 'kkuser'  (using password: YES).
  Failed to connect to MySQL server: DBI connect(';mysql_read_default_group=xtrabackup;host=127.0.0.1;port=3306','root',...) failed: Access denied for user 'root'@'127.0.0.1' (using password: YES) at - line 1314
  160830 17:50:35 Connecting to MySQL server host: 127.0.0.1, user: root, password: set, port: 3306, socket: (null)
  Failed to connect to MySQL server: Access denied for user 'root'@'127.0.0.1' (using password: YES).
  george@db-pxc-1 [~] [17:50]
  </code></pre>
  
  <p>The xtrabackup version is:</p>
  
  <pre><code>george@db-pxc-1 [~] [17:58] xtrabackup --version
  xtrabackup version 2.3.3 based on MySQL server 5.6.24 Linux (x86_64) (revision id: 525ca7d)
  </code></pre>
  
  <p>Perl version:</p>
  
  <pre><code>george@db-pxc-1 [~] [18:03] perl -MDBD::mysql -e 'print $DBD::mysql::VERSION'
  4.016
  </code></pre>
  
  <p>The server is running Debian Squeeze. I use this command all the time on ubuntu machines to perform backups and never had a problem before.</p>
  
  <p>The MySQL is not PXC, but regular Percona server. And i have plenty of disk space and memory.</p>