When I try to cat a file, after waiting for half a minute cat gives me the Input/output error and smbmount.log on the client machine shows:
[2008/05/17 11:11:11, 2] client/smbmount.c:send_fs_socket(416)
mount.smbfs[30558]: got signal, getting new socket
[2008/05/17 11:11:11, 3]...