Help: Virtual Machine tftp problem !! Struggling !! Thank you ~

Help: Virtual Machine tftp problem !! Struggling !! Thank you ~ -- Linux general technology-Linux technology and application information. For details, refer to the following section. I have installed a virtual machine on XP, and the virtual machine is redhat to use arm.
I used to use it well. The tftp file is passed to the arm board, and the nfs mounting arm board is acceptable.
One day I used arm in my classmate's notebook, and the settings were the same. tftp was not available and there was no way. Go back to the lab, and tftp won't be able to access the files.

Mount the linux system on the virtual machine into the mobile hard disk and use it on another machine. Everything works normally and tftp works.
But I cannot do it.

The same virtual machine, the same linux system. The same arm board.


Are there any heroes to solve this problem !!!!

I have been bored with lab engineers for several days. He is too lazy to care about me...

Thank you ~~~~~~~~~