Samba+NFS+SSH tunnel = file read problem

My server is running RedHat 4.0 ES. I export the same share with Samba and with NFS over SSH tunneling. As clients I have a PC with Windows XP accessing to the share with Samba and a Redhat 9.0 box accessing the share with NFS over SSH tunnels.

My problem is that a file read operation hangs on my linux client if the file has been modified and saved by the Windows client a few seconds before!

Here is my entry in fstab of the client: localhost:-UPSE UPSE nfs tcp,rw,hard,intr,bg,port=7777,mountport=8888 0 0

Here is my command to setup the tunnels:usr-bin-ssh -f -c blowfish -L 7777:localhost:2049 -L 8888:localhost:4002 193.5.229.151bin-sleep 60

I have no problem when accessing the share directly with NFS, whithout SSH tunnels. I have just noticed that the file read operation in this case takes more time to complete. I found out that the NFS server sends back the error ERRJUKEBOX for the first NFS READ operation. Then the client repeats the READ operation 5 sec. later.

Any file locking problem? Any timeout problem?

Thank you for any help.