Plesk Upgrade from 17.5 to 17.8

I came accross a strange error today as i upgraded plesk from 17.5 to 17.8. All websites was no more accessible. The error was that the SSL was not configured properly. As i use an SSL Certificate for all my websites, which had worked until now, this was by all means a very misleading error message.

To keep the story short, no error logs were present at the moment, indicating the root of the problem. So i had to look blind for the error. The error must have occured because of the upgrade right? Yes and no. The error was at the end the reverse nginx proxy. The proxy is a good idea, but i seems in this situation that it was not configured correctly. So it didn’t work as intended.

Thus said disabling the reverse proxy server saved the day and all websites were again available. Now i only have to understand why the reverse proxy failed!

But this is a story to be told later!