We have progress. On my client machine even if I use the IP address for the DEV system, I cannot click finish.
If I remote into the server and use the IDT there, I DO get the finish button.
I don't get this issue with test - that's what so confused me! So, there must be an issue with the connectivity for IDT. I don't know anything about idt - so I don't know what to start looking at next.
But we have made progress.