can't read superblock, can't mount anything from server

Hey guys,

Problem:

i don't know why, but NFS suddenly stop working yesterday night, i wanted to unmount my shared USB HDD so i stoped manually nfs-kernel-server, and portmap, after i plug it (even after server-client restarting) i keep getting the message

   wael@nasreddine:~$ sudo mount /media/WAEL_FAT/
   mount: 192.168.3.2:/media/WAEL_FAT: can't read superblock
   wael@nasreddine:~$ sudo mount -t nfs 192.168.3.2:/ /media/SERVER/
   mount: 192.168.3.2:/: can't read superblock

Information:
client:

   wael@nasreddine:~$ rpcinfo -p 192.168.3.2
      program vers proto   port
       100000    2   tcp    111  portmapper
       100000    2   udp    111  portmapper
       100003    2   udp   2049  nfs
       100003    3   udp   2049  nfs
       100003    4   udp   2049  nfs
       100003    2   tcp   2049  nfs
       100003    3   tcp   2049  nfs
       100003    4   tcp   2049  nfs
       100021    1   udp  32770  nlockmgr
       100021    3   udp  32770  nlockmgr
       100021    4   udp  32770  nlockmgr
       100021    1   tcp  32768  nlockmgr
       100021    3   tcp  32768  nlockmgr
       100021    4   tcp  32768  nlockmgr
       100005    1   udp    865  mountd
       100005    1   tcp    868  mountd
       100005    2   udp    865  mountd
       100005    2   tcp    868  mountd
       100005    3   udp    865  mountd
       100005    3   tcp    868  mountd
       100024    1   udp    603  status
       100024    1   tcp    606  status
   wael@nasreddine:~$
   wael@nasreddine:~$ ps -edf |grep po
   daemon    6543     1  0 13:51 ?        00:00:00 /sbin/portmap
   wael@nasreddine:~$ cat /etc/fstab
   192.168.3.2:/media/WAEL_FAT     /media/WAEL_FAT nfs
rw,hard,intr,noauto     0       0
   192.168.3.2:/   /media/SERVER   nfs     rw,hard,noauto  0       0
   192.168.3.2:/media/REDOUANE     /media/REDOUANE nfs
rw,hard,intr,noauto     0       0
   wael@nasreddine:~$ showmount -e 192.168.3.2
   Export list for 192.168.3.2:
   /               192.168.2.0/255.255.255.0,192.168.1.0/255.255.255.0
   /media/REDOUANE 192.168.2.0/255.255.255.0,192.168.1.0/255.255.255.0
   /media/WAEL_FAT
192.168.1.0/255.255.255.0,server.local,192.168.2.0/255.255.255.0

server:

   server:/etc# cat /etc/exports
   /       192.168.1.0/255.255.255.0(rw,sync)
192.168.2.0/255.255.255.0(rw,sync)

/media/WAEL_FAT 192.168.1.0/255.255.255.0(rw,sync)
192.168.2.0/255.255.255.0(rw,sync)

/media/REDOUANE 192.168.1.0/255.255.255.0(rw,sync)
192.168.2.0/255.255.255.0(rw,sync)

   server:/etc# cat hosts.allow
   portmap: 192.168.2.0/255.255.255.0 192.168.1.0/255.255.255.0
   mountd: 192.168.2.0/255.255.255.0 192.168.1.0/255.255.255.0
   rquotad: 192.168.2.0/255.255.255.0 192.168.1.0/255.255.255.0
   statd: 192.168.2.0/255.255.255.0 192.168.1.0/255.255.255.0
   server:/etc# cat hosts.deny
   portmap: ALL
   mountd: ALL
   rquotad: ALL
   statd: ALL
   server:/etc# cat fstab
   ### adding external Hard disks
   /dev/sda2       /media/WAEL_FAT vfat
defaults,auto,uid=1000,gid=1000,iocharset=utf8  0       0
   server:/etc# ls /media/WAEL_FAT/
   AuthorizationForm.doc  ClickHere.exe  ClickHere.ini  CRAZY FROG Axel
F .wma  gdiplus.dll  mmc  Redouane_merci wael  server.zip  wael  yvon

Question
what's going on, i tried almost everything, i can't get into the HDD using NFS :o

Thanks in advance

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