1. If you are getting this error can you click on the windows icon in the bottom left and the type in Switch server and click on that.
2. You will then be asked to enter your admin credentials.
3. Once you have entered your admin details you will then see a screen with the port number on it.
4. If the number is 40003 can you change it and enter 80.
5. Now try accessing sun again and hopefully it will work.