What is the problem? Please be detailed.
I have tried setting up the Aggregate server but cannot login as it says the "site cannot be reached, server IP address could not be found"
What ODK tool and version are you using? And on what device and operating system version?
What steps can we take to reproduce the problem?
What you have you tried to fix the problem?
Anything else we should know or have? If you have a test form or screenshots or logs, attach here.