[CentOS] Issue mounting /home area from NAS server

Hi,

Just before the Thanksgiving break, we enabled quotas on
the /home areas on the mseas-data server (running CentOS 5.8),
using the following line in the updated /etc/fstab

/dev/mapper/the_raid-lv_home /home              ext3
defaults,usrquota,grpquota      1 0

Following the Thanksgiving reboot of mseas-data we have been
experiencing problems with svn on mseas (our front-end machine,
running CentOS 6.2). After consulting with the svn mailing list,
it appeared to be a communication issue between mseas and mseas-data.
We therefore rebooted mseas. Now mseas is not mounting /home.
We get the following error

[root at mseas etc]# mount mseas-data:/home
mount.nfs: Unknown error 521

We have tried this mounting with both of the following lines
in fstab and got the same error

mseas-data:/home        /home               nfs     defaults        0 0

mseas-data:/home        /home               nfs
defaults,usrquota,grpquota        0 0

(the latter was to mimic the mounting of /home on mseas-data)

The only thing we've found out on the web so far was advice
on editting /etc/exports to have an "insecure" option for
the export of /home, which we already had.

Any thoughts on how to resolve or debug this issue would
be greatly appreciated.

Thank you.

-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Pat Haley                          Email:  phaley at mit.edu
Center for Ocean Engineering       Phone:  (617) 253-6824
Dept. of Mechanical Engineering    Fax:    (617) 253-8125
MIT, Room 5-213                    http://web.mit.edu/phaley/www/
77 Massachusetts Avenue
Cambridge, MA  02139-4301