connecting linux to windows

I am trying to connect to a windows share on win 2000 advance server.I try to mount the share on my Linux box but I get a session setup failed:ERRDOS – ERRnoaccess (Access denied.) the command I use is
smbmount //day/2kshare myshare -U john -I 10.0.0.1
then I am asked for the password and when I type the password I get the above error. Does anyone know what I am doing wrong, why I cannot connect.