about debug nios2 AP useing NFS

hi:

I am want to useing NFS server to debug nios2 application.

1)I opened NFS sevice in my FC4.

2) test NFS sevice

in my FC4 terminal I type command:mount 192.168.1.252:/ /mmt

mount success.

3)mount my nios2 board.

in nios2 uclinux shell i type command: mount -o nolock 192.168.1.252:/ /mnt

mount success. I can find FC4 / in nios2 uclinux /mnt dir

4)exec ./hello

in /mnt dir, I type command:./hello

but I did not recive the exec infomation.

the shell return the following infomation:

nfs: server 192.168.1.252 not responding, still trying

How can I solve the quesion? I think use the nfs debug nios2 AP is the best debug mothed.

Thanks