Restore XAMPP database I have a complete backup of my XAMPP installation.
Unfortunately I forgot to export my database to .sql files. But as mentioned i have all .frm, .idb and ibdata1 ib_logfile* and so on.

However if I simply copy the backed up files into the /opt/lampp/var/mysql directory I get the following error:

(Switching back to the original directory created by the XAMPP installation is completely fine, though.)


  Connection for controluser as defined in your configuration failed.


and


  phpMyAdmin tried to connect to the MySQL server, and the server
  rejected the connection. You should check the host, username and
  password in your  configuration and make sure that they correspond to
  the information given  by the administrator of the MySQL server.


For my /opt/lampp/var/mysql folder I did

sudo chown -R mysql mysql
sudo chgrp -R mysql mysql


What am I missing to restore the database from the XAMPP backup?
I don't know why I didn't try this earlier, but a simple reboot resolved this issue. Note, that the simple restart of xampp and thus of mysql and apache did not work.