if you get this error it might be because the permissions for the folder on the server need to be set to 755
like this:
# on the server
chmod 755 /path/to/shared/folder
chmod 755 /path/to/shared/folder
full story:
# on the server
mkdir -p /path/to/shared/folder
chmod 755 /path/to/shared/folder
vim /etc/exports
# ip of client allowed to access it
/path/to/shared/folder 192.168.178.125(rw,sync,no_subtree_check)
exportfs -a;
# client
mkdir -p /mnt/nfs/folder
# try to
# ip of the server
mount -vv 192.168.178.75:/path/to/shared/folder /mnt/nfs/folder
mkdir -p /path/to/shared/folder
chmod 755 /path/to/shared/folder
vim /etc/exports
# ip of client allowed to access it
/path/to/shared/folder 192.168.178.125(rw,sync,no_subtree_check)
exportfs -a;
# client
mkdir -p /mnt/nfs/folder
# try to
# ip of the server
mount -vv 192.168.178.75:/path/to/shared/folder /mnt/nfs/folder