Prepare the environment to test, "lead" your application very close to the state when the problem appears. One is used as the 'WAN' and connects to the host network via Virtualboxs Bridged.Note: If the situation is 100% reproducible and it takes some time to reproduce, the following steps are recommended to create the pcap file: Note: Don't forget to disable tracing after you finished the investigation because your hard disk will quickly be filled by pcap files in case of intensive network usage.The port-forwarding configuration might be affected by this setting as well (this is valid for releases prior VirtualBox 4.0). However, by default, there is none created. 'Invalid settings detected' - one reason may be because there is no motherboard memory left.Go to Settings->System->Motherboard, and reduce the base memory.Like for me it was fully utilized and I changed it from 100 to almost 50, like below and it worked. With VirtualBox, you can also create additional NAT networks. # VBoxManage modifyvm "ubuntu" -nictrace1 on -nictracefile1 file.pcap This includes Virtual Box, Sonic VPN, etc. # VBoxManage modifyvm -nictrace on -nictracefile file.pcap To enable network tracing do the following: Network problems could be detected by enabling packet logging at the guest side or at the host side, but using the built-in capability of VirtualBox to create pcap files might provide even more useful information because it contains a log of really all packets received and sent by guest.
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