Part 1:
On the AWS side make sure the following ports TCP ports 135, 445 and 1024 "through" 65535 are opened.
Part 2:
Explicitly state the AWS host entry in "hosts" file of the server that you put the Diagnostic Server on.
1. In AWS, type in ipconfig and note the hostname and "public" IP Address.
2. Back in the Diagnostic Server host machine, go to "C:\Windows\System32\drivers\etc".
3. Make a copy of the hosts and put it on your desktop for safe keeping.
4. Back into C:\Windows\System32\drivers\etc, open the hosts file with notepad in admin mode.
5. Add this at the very end of the file, <IP> <Hostname>, and save it.
For example: 23.20.187.91 WIN-7B95BB9UCC
6. Try to add the AWS into Spotlight again.
