Hi,
You'll have to provide a few more clues here.
You just installed KonaKart? Was that on Windows XP? using the wizard-based installer? using the default port number (8780)? pointing at MySQL vXXXX? Did you get the installer to create your database objects for you? Did you notice any errors during the installation?
Next, you said "can not connect to it". Does this mean you cannot see the demo store application in a browser at
http://localhost:8780/konakart/ ? (Or is this a failure to connect through the java API or via SOAP?)
If not, what do you see in the browser?
Have you started tomcat? What do you see in your tomcat log?
Regards,
Trevor