automounting nfsv4

[Clem Takahashi]

I'm following https://help.ubuntu.com/community/SettingUpNFSHowTo and 
http://wiki.linux-nfs.org/wiki/index.php/Nfsv4_configuration to set up 
NFS v4 without Kerberos.  The server on 192.168.1.1 is running natty, 
dist-upgraded from maverick, and appears to be set up correctly because 
I can manually mount shares on clients running karmic with:

sudo mount -t nfs4 -o proto=tcp,port=2049 192.168.1.1:/user1 
/home/user1/Share
sudo mount -t nfs4 -o proto=tcp,port=2049 192.168.1.1:/user2 
/home/user2/Share

However, I can't automount with these /etc/fstab entries:

192.168.1.1:/user2  /home/user2/Share  nfs4  proto=tcp,port=2049  0  0
192.168.1.1:/user1  /home/user1/Share  nfs4  proto=tcp,port=2049  0  0


There don't appear to be any significant error messages in 
/var/log/messages.  The messages that contain the strings nfs, rpc, or 
mount are:

May 16 21:05:48 cl1 kernel: [    0.001732] Mount-cache hash table 
entries: 512
May 16 21:05:48 cl1 kernel: [    3.363645] EXT4-fs (sda1): mounted 
filesystem with ordered data mode

May 16 21:05:48 cl1 kernel: [   24.548685] RPC: Registered udp transport 
module.
May 16 21:05:48 cl1 kernel: [   24.548689] RPC: Registered tcp transport 
module.

May 16 21:05:48 cl1 kernel: [   25.019198] Installing knfsd (copyright 
(C) 1996 okir at monad.swb.de).

Any ideas how to debug this problem?

Clem