uid and gids not mapped in nfs

["land fish" <landfish@in.com>]

Hello,
I have a nfs setup with the server running wheezy and the clients are running squeeze.
In the server nfs-kernel-server 1:1.2.5-2+b1 is installed and the clients have nfs-common version 1:1.2.2-4 installed with nis.
In the clients the uid and gid s are not mapped, file permissions are showing nobody nobody .
But this problem is not occuring for one client that has wheezy installed.
Things used to work ok till I upgraded my server from squeeze.
Do I have to compile the latest nfs-common in squeeze ?
Please suggest.

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