See attached picture. Using Ambari RPMs are build by source code tag release-2.7.0-rc0.
Web browser is chrome.
@Yao Lei ,
by seeing the message it looks like its wating for some response from server. Having a look at the /var/log/ambari-server/ambari-server.log will be helpful.
After installing Ambari, reboot your server(OS) and wait for loading all its services.
Then try installing again, but still you may face same problem when Installation is in progress.
So right now the solution we found is restarting "ambari-server" and "ambari-agent"