Experiencing a lot of downtime
I'm using uptimerobot.com to measure the uptime of my server. Unfortunately it goes down a lot! Almost twice a day for maybe just one to two minutes. I can't find anything in my logs and am completely lost what is going wrong. I've looked at all log files and can't find anything out of the ordinary (apart from the 301 responses from uptimerobot.com). I have no clue what to look for now.
I'm using Varnish on port 80, Nginx on port 443 and Apache on port 8080. Both ports 80 and 443 are open. When I go to my site (quentinbuiteman.com) on all possible URL's, I just get there, so the configuration seems to be working correctly.