In addition to above steps (1) and (2) do following also in case if it doesn't work
3) add hostname entry added in step 1 to /etc/HOSTNAME, to make it persistent across reboots.
4) vi /u01/app/oracle/product/11.2.0/xe/network/admin/listener.ora
Here delete .<localdom> after xe in line GLOBAL_DBNAME=xe.<localdom>
finally line should look like
(GLOBAL_DBNAME=xe)))
Now either do
service vmware-vcd stop
/etc/init.d/oracle-xe stop
/etc/init.d/oracle-xe start
service vmware-vcd restart
-OR-
reboot vcd.
Regards,
Murali G D