@Dalton-Childers So the simple test, you attempt to get the undionly.kpxe file, then you try to get the undionly.0 file. Because the undionly.kpxe file exists, you’re not seeing an error, but because the undionly.0 doesn’t exist, you’re seeing the error on the second command. This sound correct.
Now that you know that at the least the tftp server is operating locally. Now we need to see where it breaks down.