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When Matomo (Piwik) displays an error message An error occurred: Cannot connect to the database this means that Matomo was not able to connect to your Mysql database.
To solve this problem you can:
Contact your system administrators and ask them to verify that the Mysql server is up and running
If your Mysql server is up and running, maybe the username or password used to connect has changed? To update the Mysql connection information, edit your configuration file config/config.ini.php to view and edit your connection details.
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