How to install Microsoft Dynamic Nav 2009 R2 Client and Server

Dear all,
I have tried installing Nav 2009 R2 classic option to have multiple clients to connect to a central database in a server machine, but could not get it work. When i install the server and then install the client and tried to connect the client to the server, It gives "TCP/IP error ECONNREFUSED". I have ping the server from the client machine and get replies. I have turned off the firewalls on the server and still get the same error.

Is there anything i need to configure during or after installing the server? Do i have to do some configurations to the client as well? Please can someone help me with the steps i need to take to get this working correctly?