I have recently installed and configured a new server on my raspberry pi 3B. I used PINN as my bootloader and installed some OSes (Fedberry - an Raspberry Fedora implementation - being the main one). I have configured everything on the bootloader an Fedora itself that I wanted to work.
The pi os working solely as server without display or any other peripherals. I'm connecting to it over SSH or VNC to do some configuring.
Lastly I had to unplug my Raspberry for few hours. After plugging it in again there was no network connection to it (neither ping, ssh nor vnc). I didn't tried looking into it with display for troubleshooting, instead I restarted my router (Fritz Box 7360) and could connect to my Raspberry as everytime before again.
After that my guess was, that it would be something about DHCP configuration on my Raspberry but it seems fine. I tested some configurations like nmcli (Network Manager CLI) and could confirm that services like DHCP are actually working.
I can't find any reason why the raspberry that normally connects to the wired network can't repeat the process after being unplugged and plugged back in. When I reboot through the Fedberry CLI via sudo reboot I have no problems whit connectivity.
I would be glad about some directions about where to look for a solution to the problem. The Firtz Box restart workaround works but it removes the connectivity to the internet to other devices for the reboot time. Besides I imagine there is some solution to this problem that I'm simply missing.
Thanks in Advance.
Edit: When I talk about unplugging it's not about ethernet cable but the power cable to shut down the device.