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I am using several Linux guest in VirtualBox on a windows 10 laptop.
A week ago the networking in all 6 Linux guests in VirtualBox stopped working. These Linux distros include Debian and Ubuntu variations.
I have a similar setup on my desktop which still works fine.
I compared all the network setting on both computer and they are the same, but on the desktop I have full network access, but on the laptop I can ping 8.8.8.8 but not www.google.com.
I have un-installed VirtualBox and reinstalled, Version 5.1.18 for windows, 3 times on the laptop with no change.
My laptop is a Toshiba Satellite P50t with 16Gb ram and 1Tb SSD hard drive.
I was using Wifi, but I have just connected to Ethernet cable with no change.
I have tried adding nameserver 8.8.4.4 and 8.8.8.8 to resolv.conf with no effect.
Luc
I had exactly the same problem, so I would like to add one more symptom: Remote desktop to a running VM stops working, even from the host (on localhost). Otherwise thanks to jseguillon, the solution worked for me as well. – Michal Kaut – 2017-04-03T11:08:27.337