Lion as Kerberized NFS4 client not working

Greetings,
I have Lion 10.7.3 as a new install, trying to get kerberized NFS4 working. "kinit someuser" works and I get a valid ticket, so communicating with the KDC ok. Note kerberized NFS4 is working well on a bunch of linux clients, I do have the "insecure" option set on the NFS server. Firewalls all off for testing. Keytab containing host and nfs successfully transfered to the mac with correct kvno.
sudo mount -v -t nfs -o sec=krb5,vers=4 NFS_Server_Ip:/Dir_to_be_exported /Users/some_user/mountpoint
results in:
"mount_nfs: can't mount /Dir_to_be_exported onto /Users/some_user/mountpoint: Permission denied
and in /var/log/kernel.log
"nfs_gss_clnt_gssd_upcall: gssd port not valid
nfs4_setclientid failed, 13"
Permisions all ok as far as I can see and as I said, this is working fine on several Linux clients. The KDC is Linux MIT.
I've been doing some research and these kernel log messages were questioned in quite a few 2008 threads, with no apparent successful resolution - I hope it's not the same bug!
All suggestions gratefully accepted,
BRgds/Alan

For the benefit of others:
Apple Support have confirmed that Kerberized NFS4 does not work under Mac OSX. (and I suspect it never has). I'll restrain myself from further comment ...
Rgds/Alan

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