NFS perms problem

[Randall J. Parr]

I am running [K]Ubuntu Feisty AMD64.

I have several directories which actually reside on a RedHat 8 system 
mounted via NFS.
One such has mount point /web.

When I try to change to a subdirectory of web, for example /web/ta/test 
I get "Permssion denied".
There are several other subdirectories of web which I can change to.

All the directories are owned by user "apache" and have permission 
drwsdrws---
lsattr output (on source machine) is clean and looks the same for all 
the subdirectories

I can changed to a subdirectory if its group is the same as my primary group
I can change to a subdirectory if its group is "developer" which is one 
of my supplementary groups
I can not change to a subdirectory if its group is "production" which is 
also one of my supplementary groups.

The UID/GIDs involved (mine, "apache", "developer", "production", ...) 
are the same on both systems.

If I copy the directory tree to the local filesystem, preserving 
permissions, etc. I can change to all the subdirectories just fine.

I also have a Debian etch AMD64 partition on the same machine.  From 
that, I can mount the same directories, from the same source, at the 
same mount points, and change to all the subdirectories just fine.

It seems to be specific to directories I mount with NFS under Feisty.

Any help or ideas would be greatly appreciated

Thanks
R.Parr, RHCE, Temporal Arts