Hi, sorry for the delay replying.
In the wizard flow for importing the VM, there is a step where you are required to select the DS where the VM will reside. Even though I could select the DS, the UI would not enable the "next" button and I couldn't move forward. So in summary, 5.0 didn't work (import failed), 5.1 failed (couldn't press next). 4.3 worked.
I can't tell for certain, but I don't think the DNS error was a factor to the importing issue - said differently, I didn't go back to "unchange" it to test this out once I got 4.3 working
Cheers