Hi Sometimes when opening a web page, it shows 404 error or this site can't be loaded error message for a few seconds, than the page shows. The server loading is low with many free memory. I am running Ubuntu 18.04 + Nginx + Ispconfig 3. I wonder what is causing this, and how to troubleshoot.
I checked nginx and website error logs, can not see anything related. this issue only happens sometime, and working fine 95% of the time. I don't know what php.ini settings may be causing this.
Very strange. Then it definitely looks like there could be something wrong with your server availability or bind. Try pinging your server a few times from an other server and check the response log
