NFS not working between servers, Permission Denied

[ch123]

I have 3 servers, A , B and C

A is the "master" and I've set up an nfs share between B.
That's working fine.

I then created a nfs share between A and C. I can see the share with ls -al
but I can't copy files between A and C. I can copy between A and B ??

When I try to copy a file between A and C I get this error:

bash-3.2$ cp test.html /mnt/share2
cp: cannot create regular file `/mnt/share2/test.html': Permission denied

on server A I have a /etc/fstab

A:/var/www/html/folder1 /mnt/share nfs owner,rw 0 0
B:/html/folder1 /mnt/share2 nfs owner,rw 0 0

after I restart nfs and netfs I can , cd to both /mnt/share and /mnt/share2

I need to use a user with name "user1" to copy the files

when I cd to /mnt and do a ls -al I see
drwxr-xr-x 2 user1 user1 122880 Sep 10 17:01 share
drwxr-xr-x 2 dummy2 dummy7 118784 Aug 26 17:06 share2

NOT SURE why share2 has dummy2 and dummy7 as owners ??
It used to show just the group ids I think, but I created a few dummy users dumm2, dummy3, etc and it showed those dummy names instead

I tried using gpasswd -a user group
to make sure that user1 was in group dummy2 and dummy7, dummy2 in user1 and dummy7 and dummy7 in user1 and dummy2 groups ... just to have it all covered. but still have the same problem

I don't use /etc/hosts.allow and /etc.hosts.deny

/etc/exports on server B
/var/www/html/folder1 A(rw,sync)

/etc/exports on server C
/html/folder1 A(rw,sync)


on both B and C I have a /etc/hosts file

10.10.10.101 A

any ideas would be appreciated !

[ch123]

I could see that user1 on server B and server C have different user and group ids