mount /var to another disk partition + linux RHEL 6.5 (AWS Virtual box)

i tried to mount /var to a disk partition in RHEL 6.5 (AWS Virtual box). whenever i do this SSH connectivity is getting lost with this error message "Network connection error".

Followed these steps for performing this activity.

SELINUX=disabled /* (disabled SELINUX) mkfs.ext4 /dev/xvdb1 /*Formatting drive
mkdir /mnt/var /*Make /var directory

mount /dev/sdb1 /mnt/var/ cp -axR /var/* /mnt/var/ mv /var/ /var.old mkdir /var umount /dev/sdb1 mount /dev/sdb1 /var

Made fstab entry for /var mount point /dev/sdb1 /var ext3 defaults 0 0

After this change, if i open a new session or reboot the machine SSH is not happening to the Linux server. Kindly provide your suggestions if i missed some steps.

Thanks in advance, Robin