For a first debugging, you can do via SSH in the console: "wget localhost:11000". It will download a html file. Open it and check you have no error (a normal HTML that would be the homepage of DSS).
1) If you have no error, it means that the problem comes from the network environment/configuration. It depends on your situation. Where did you install it? In the cloud? Is it behind a firewall? Can you ping dss.mydomain.com? Can you open http://dss.mydomain.com?
2) If you have an error or empty file, DSS is not running or have a problem. Check DSS logs to know more.