[K12OSN] Can't login from secondary server

[Krsnendu dasa]

I have two ltsp servers. One mounts /home by nfs from the other.

When logging in on terminals that are booting from the server with /home it
works fine. From the other server we get the error-
GDM could not wirte to your authorisation file. This could mean that you are
out of disk space or that your home directory could not be opened for
writing. In any case, it is not possible to login. Please contact your
system administrator.

What do i have to do to fix this?
/home seems to be mounted. As root I can list the directories although I do
not have access to the /home directories.
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