Find and copy the system check in Matomo On-Premise I get ‘Oops… there was a problem during the request.’ or ‘Internal Server Error’ or ‘500 error’ or the ‘White screen of death’. How do I proceed?Matomo does not track visits on SSL / HTTPS pages.Matomo reporting UI doesn’t have any css style or, the menu text appears on a white background, or I get JavaScript errors in the Matomo UI. How to fix this display problem?Enable unicode characters (Japanese, Chinese, Russian, Hebrew, Arabic, etc.) in graphs in PDF/HTML reports and Matomo Mobile graphsSparklines (evolution graphs) are missing in the Matomo dashboard.Emails from Matomo are not being sent, how do I troubleshoot and solve the issue?I’m a developer, how do I enable logging (and / or SQL profiling) in Matomo?Graphs in PDF/HTML reports and/or Matomo Mobile do not display characters correctly in my language (display squares instead).Why am I getting a warning about an untrusted hostname?Find the cause of the Brute Force detection blocking access from a specific IPAntivirus program or malware checker or Google Ads claim that matomo.js or piwik.js are malware, what can I do?Matomo is slow after creating a custom report, funnel or installing users flowWhy some pages or actions show a lower pageviews metric, but for a longer time period?Matomo doesn’t show me when new updates are available, and the SEO plugin doesn’t work.Almost all reports and dates are working fine except one or a small number of days/weeks/months/date ranges which display zero visit. How do I fix this issue and restore the missing data?Force the reports to be re-processed from the logsAll visitors have the same IP address and Provider. How do I track individual IPs?How do I fix that the time is off by one hour? (timezone that doesn’t use the correct offset)I get the error Warning: Unexpected character in input: ‘\’ (ASCII=92) state=1Matomo reports this error and doesn’t continue: « Fatal error: Maximum execution time of 30 seconds exceeded in … »Fix the error « Call to undefined method MaxMind\Db\Reader::getWithPrefixLen() »Matomo reports this error and fails: « Fatal error: Allowed memory size of X bytes exhausted (tried to allocate X bytes) ». What should I do?Emails sent from Matomo use the email address, how do I specify my domain name instead?Fix the error « Parse error: syntax error, unexpected T_STRING in … »I get the error message: « Fatal error: require_once() [function.require]: Failed opening required XYZ in /path/piwik/XYZ.php on line X ». How can I get Matomo to work?« Segmentation fault Error ». Matomo reporting or via cron crashes with Segmentation Fault error. What to do?Fix the errors « Unable to write in the cache directory » or « The directory matomo/tmp/cache/* » is not writable. »I get: PHP Fatal error Call to undefined function imagecreatefrompng()I get the error message: « Fatal error: Class ‘not found in … ». What’s wrong?Fix the error « SMTP Error: Could not authenticate. »Fix the error ‘Fatal error: Maximum function nesting level of ‘100’ reached, aborting!’I get the error « Warning: gzuncompress() [function.gzuncompress]: data error » when looking at my Matomo reports.Fix the error private directories are accessibleWhy many of my visits have « 0 Action » in Matomo and how do I fix this issue?Fix timeout errors when trying to create a user auth tokenTroubleshoot when Chrome shows a warning on your Matomo domain