#StackBounty: #networking #ubuntu #virtualbox #virtual-machine VirtualBox network stops working

Bounty: 50

I have VirtualBox 6.1 running on Windows 10. It is running virtual machine with Ubuntu server 18.04 LTS. It can work couple of weeks without any issues, but sometimes VM completely looses network. It is not available to connect to (using ssh like putty) and services, which are running in VM also cannot connect to anything (cannot send email, resolve DNS). The VM itself is running, I can control it using VirtualBox window.

Restart from Ubuntu (shutdown -r now) does not help. After restart it still does not have network. Complete shutdown (shutdown -h now) and then start helps.

What could be wrong? How I can investigate and find the reason of the issue?

Get this bounty!!!

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