Ok, so having real issues after I upgraded to the latest version of Joomla on one of my hosts. Running Debian 7/Nginx Everything worked fine pre Joomla upgrade, post upgrade I keep getting 502 errors every 5 minutes or so. This locks me out of the website totally so I can't do anything. Where do I start looking for error logs or has anyone come across an issue like this? Steve
Please check the error.log file that is in the log folder of the website. Do you see a Joomla or ispconfig 502 error message? If it's an error message from ispconfig, then try to disable custm error pages for this site in ispconfig, it might be that a Joomla generated error page contains additional details on that issue.