Why is a nfs server mounted as rw returning read only filesystem errors

Why is a nfs server mounted as rw returning read only filesystem errors

I am working on a Ubuntu Server 64bit. I have mounted an nfs as rw, but
whenever I try to edit anything on the mountpoint in question, I get a
read-only filesystem error
my etc/fstab reads:
# <file system> <mount point> <type> <options> <dump> <pass>
proc /proc proc nodev,noexec,nosuid 0 0
/dev/mapper/product-root / ext4 errors=remount-ro 0 1
UUID=1cae6948-ca9d-4f0b-aec6-9e7a60bbbad8 /boot ext2 defaults
0 2
/dev/mapper/product-swap_1 none swap sw 0 0
/dev/fd0 /media/floppy0 auto rw,user,noauto,exec,utf8 0 0
vnxnfs1.company.com:/NFS2 /mnt/nfs2 nfs
defaults 0 0
mount returns:
/dev/mapper/product-root on / type ext4 (rw,errors=remount-ro)
proc on /proc type proc (rw,noexec,nosuid,nodev)
sysfs on /sys type sysfs (rw,noexec,nosuid,nodev)
none on /sys/fs/fuse/connections type fusectl (rw)
none on /sys/kernel/debug type debugfs (rw)
none on /sys/kernel/security type securityfs (rw)
udev on /dev type devtmpfs (rw,mode=0755)
devpts on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mode=0620)
tmpfs on /run type tmpfs (rw,noexec,nosuid,size=10%,mode=0755)
none on /run/lock type tmpfs (rw,noexec,nosuid,nodev,size=5242880)
none on /run/shm type tmpfs (rw,nosuid,nodev)
/dev/sda1 on /boot type ext2 (rw)
rpc_pipefs on /run/rpc_pipefs type rpc_pipefs (rw)
vnxnfs1.company.com:/NFS2 on /mnt/nfs2 type nfs (rw)
cat /proc/mounts returns:
rootfs / rootfs rw 0 0
sysfs /sys sysfs rw,nosuid,nodev,noexec,relatime 0 0
proc /proc proc rw,nosuid,nodev,noexec,relatime 0 0
udev /dev devtmpfs rw,relatime,size=16465812k,nr_inodes=4116453,mode=755 0 0
devpts /dev/pts devpts
rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000 0 0
tmpfs /run tmpfs rw,nosuid,relatime,size=6590172k,mode=755 0 0
/dev/mapper/product-root / ext4 rw,relatime,errors=remount-ro,data=ordered
0 0
none /sys/fs/fuse/connections fusectl rw,relatime 0 0
none /sys/kernel/debug debugfs rw,relatime 0 0
none /sys/kernel/security securityfs rw,relatime 0 0
none /run/lock tmpfs rw,nosuid,nodev,noexec,relatime,size=5120k 0 0
none /run/shm tmpfs rw,nosuid,nodev,relatime 0 0
/dev/sda1 /boot ext2 rw,relatime,errors=continue 0 0
rpc_pipefs /run/rpc_pipefs rpc_pipefs rw,relatime 0 0
vnxnfs1.company.com:/NFS2 /mnt/nfs2 nfs
rw,relatime,vers=3,rsize=32768,wsize=32768,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,mountaddr=172.x.y.z,mountvers=3,mountport=1234,mountproto=udp,local_lock=none,addr=172.x.y.z
0 0
Files on the mnt read just fine but whenever I try to change anything I
get an error:
touch: cannot touch `/mnt/nfs2/path/to/test_file.txt': Read-only file system
I can connect to the nfs in question from other servers and read and write
just fine. The only problem is on this server. I have tried mount -o
remount,rw vnxnfs1.company.com:/NFS2 /mnt/nfs2 as answers to related
questions suggest, but to no avail.
Sorry for the data dump, I just tried to include anything that could yield
clues.