I recently Installed wicd to manage my network connections which removed the network manager. Later I reinstalled the network manager but i cannot use any network connection like before. It connects fine to wired, wireless and mobile broadband and gets ip addresses for dns and default gateways.

The problem is I cannot ping any ip i get "operation not permitted" trying to browse firefox reports that i dont have a working network connection so i get a page load error! Even after reinstalling wicd again I get the same response. I had enabled nat and disabled it but still not working. Am using 9.04. Any Ideas and solution?
Thanks in Advance.