Hi Alessio, Hi all,
quite unexpected to be mentioned here, thank you! 
So… I had quite a lot to do with NethServer in the last two weeks. I’ve been working with the NethServer-Docker plugin (always been interested in running Docker there). At the moments works great, just need to realize how to setup the firewall correctly.
Immediately afterwards the server I was working on started crashing during the night, leaving a kernel stack-trace on the console. Updated the kernel to the latest LTS (4.4) and set vm.dirty_ratio=10 in sysctl solved the problem that hasn’t appeared again (thank you @syntaxerrormmm) .
Another issue I’ve been working on for a client was regarding smart-working. This clients wanted to access remotely their desktops. In a first step, when they worked max 1 per time remotely, they used a VM but due to the current situation they need to work more from home. They started leaving they’re PCs turned on but let’s face it… it was not environmental-friendly at all. I decided to setup Guacamole, the version 1.2.0 has built-in WOL that should have solved this problem. At the end of the day this was not true at all… there has been many problem we (I need to thank @mrmarkuz) described in this thread such as that epel does not provide the latest version of Guacamole’s daemon guacd.
Hope you guys are all fine! Stay safe,
Marco