I came into work to a problem I haven't run into before, and was curious to see if anyone here might have any ideas about what may have caused it.
We run a VPS from Slicehost and sometime yesterday, the sites we host went down (after working properly for several months since I did anything with the server), but only those over HTTP (using port 8080). The HTTPS sites (standard port) were still operational, if they were accessed specifically using https://site.com (as opposed to putting in site.com and letting the redirects do the work), as well as SSH connections directly to the server.
It stayed like this until this morning. I rebooted the server, but that didn't help. I SSHed into it and made sure everything was up and running properly. There were no error messages out of the ordinary in the Nginx logs or other logs that I checked. Still, nothing changed. Then all of a sudden, about half an hour after I did that, while I was searching to find the cause, the sites started working again.
I never did find anything about what might have caused the issue (everything I was finding was client side issues), so I was curious as to what might have potentially caused the issue. That way, I could better diagnosis and fix it if something like this happens again.