I got a message notifying me that the website wouldn’t load. I logged in and I found some timeout errors on the error log of the website. After further investigation I found out that the were related to nginx.
Restarted nginx and the website loads fine.
However I would like to find the root of this issue. I had a look in the error log of nginx and I found the following multiple times:
Open Socket # left in connection
NGINX VERSION: 1.14.0 (Easyengine)