[rhn-users] rpc.mountd: refused mount request ... no export entry

[FM]

Hello strange problem here :
On one station, I cannot mount a nfs exported FS when using netgroup


on the server (server1):
/etc/exports
/home	@linux-all(rw,sync,root_squash)

/etc/netgroup
linux-clients (station1,,)
linux-all linux-clients linux-servers

exportfs -rv :
reexporting station1:/home to kernel


on station1 :
mount -t nfs server1:/home /home
result :
mount: server1:/home failed, reason given by server: Permission denied

server log :
May 18 10:07:23 server1 rpc.mountd: refused mount request from 
192.168.4.212 for /home (/): no export entry

192.168.4.212 is station1

I restart portmap and nfs on server1 but the results are the same.

Stations1 : RHEL 4
server1 : RHEL 3

Thanks!!!