[CentOS] NFS - Strage Problem

Hi Dear List,

i am experiencing strange problem with NFS, they is CentOS 6.2 x86_64
machines. One CentOS is sharing two directories (following)

/etc   192.168.0.41(rw,sync,no_root_squash)
/var/named/master   192.168.0.41(rw,sync,no_root_squash)
nfs is started on server side

there are proper entries in fstab at client side for both shares. however
server is able to mount "/etc" alright but not "/var/named/master"

any idea ? why that.

Thanks

Nath