Browsing NFS in Konqueror

I've set up lisa to browse my LAN and have been able to check SMB, FTP, and HTTP services but can never get a listing of NFS shares, even on my own computer. When I go to lan://localhost/localhost and then click on NFS I get the message: "Authorization failed, localhost authentication not supported." When I try it on my other computers, it doesn't work and I get the same error message. Is there some other daemon I need to start here? Thanks for any help.