[CentOS] mount CIFS issue with CentOS 6.4

I have a NAS that I can connect to just fine with a CentOS 6.3 box.
But when I try the same exact command on my CentOS 6.4 box I get this error.
mount -t cifs //xxx.xxx.xxx.xxx/mailserver/ /mnt/test -o 
username=xxx,password=xxx
mount error(13): Permission denied
Refer to the mount.cifs(8) manual page (e.g. man mount.cifs)

I've been googling, trying different things all afternoon, please help

Thanks
Dan