New created virtual machine can't connect to external network after I configured two virtual machine to use internal network.

I was trying to setup two virtual machines to only communicate to each other, so I changed their virtual network adapter from 'Virtual network' to 'Internal network', and it worked fine. But I realize I need to copy some files from my computer to one of them, so I changed one back to use 'Virtual network', but it can't connect to external network anymore. I created one more virtual machine to use 'Virtual network', but it can't connect external network. All of old virtual machines that created before these changes have no problem of connecting to external network.

Please help,
Thank you,
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If the old virtual machines -do- work, could it be an option to copy the files to that machine, then change that machine to the Internal network and transfer it over to the according Virtual Machine.

fionaxie123Author Commented:
We figured out what the problem was. When we tried to configure the 'Internal network', we accidentally checked the 'enable the DHCP server' for both 'Internal network' and 'Virtual network'. The DHCP server for 'Virtual network' should be disabled. After we disable it, it start working.
Olrik, thank you for your reply.

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