>Technical Support>2015-12-30 Upgrade Issue: http 503
an amazing likeness
Web server(s) seemingly are routinely generating http 503 errors when accessing the forums. Anecdotally, I'd estimate 5% of new browser sessions against the forums are returning 503.
I've done my best to live the right way. I get up every morning and go to work each day. (thru 3-29-19)
They're caused by the frequent updates. The web servers are updated serially. The upgrade process involves shutting down each web server, deploying the patch, and then bringing up the server again. When a web server goes offline, it takes about a second or two for the load balancer to notice and reroute the request to another server. I have plans to switch to a different load balancer that allows me to tell it that a web server will be going offline. When I do that, then the 503s should go away.