new NFS connections being refused...DSSv5

i have a v5 DSS server that i am looking to upgrade soon but still stuck on
it at the moment.. we have this server backending vcenter hosts. yesterday
we vmotioned hosts around and reworked some of the networking. it seems
that now we cannot add another connection to the NFS share. the host that we
want to add is already listed in the 'active connections' . is there a
way to bounce that connection?

we have tried adding other hosts but no luck. all are refused.

below is the logs from our vcenter..

thanks

r
***********

Jul 1 12:34:40 vobd: Jul 01 12:34:40.369: 57256023435us:
[esx.problem.vmfs.nfs.mount.connect.failed] Failed to mount to server
10.31.20.2 mount point /share/es2-01. Error: Unable to connect to NFS
server.
Jul 1 12:34:40 Hostd: [2011-07-01 12:34:40.370 234EDB90 info 'ha-eventmgr']
Event 15 : Failed to mount to the server 10.31.20.2 mount point
/share/es2-01. Unable to connect to NFS server

I can definitely ping the NAS:

/var/log # vmkping 10.31.20.2
PING 10.31.20.2 (10.31.20.2): 56 data bytes
64 bytes from 10.31.20.2: icmp_seq=0 ttl=64 time=0.183 ms
64 bytes from 10.31.20.2: icmp_seq=1 ttl=64 time=0.137 ms
64 bytes from 10.31.20.2: icmp_seq=2 ttl=64 time=0.139 ms

--- 10.31.20.2 ping statistics ---
3 packets transmitted, 3 packets received, 0% packet loss
round-trip min/avg/max = 0.137/0.153/0.183 ms

Try to Reset the NFS in NAS Settings then turn back on - make sure you have the latest version - 4562