Ah - by request from my inbox - Is this the result of a security breech?
Nope, that's not an issue.
From admin - nginx is a web server app that can also function as a proxy server.
And while I've not seen it yet today, you may also see a MySQL 2006 error.
The 2006 error says that there was a network issue that kept our front-end user interface (GUI) from connecting on time with the back-end database (where the posts are really stored). And we've monitored a few of those lately - just saying.
So, this is all some sort of IT problem.
Hope this helps!