NETCA warning while creating listener

Question

Hi!
I am trying this on r virtual box, OS is OEL, my DB is Oracle 11gr2, Network is not static ip, DHCP mode using TCP/IP protocol
There was an installed DB on the virtual machine,
I dropped the db, deleted the listener and changed the host name of the VM.
then I tried to create the listener by executing NETCA.
When I try to create the listener there is a warning appearing as
"*Use another port number*" and it says The information provided for this listener is currently in use by other software on this computer. You can proceed with the configuration as it is, but it will not be possible to start this listener until the conflict is resolved. Would you like to continue with the configuration anyway?
I checked whether really a port conflict but it not the case, changed to other ports , but the warning was there.
as a trial I ignored the warning and created the listener.
but when I tried to start the listener. It give the following error:
*[oracle@cd-sashraff ~]$ lsnrctl stat*
LSNRCTL for Linux: Version 11.2.0.1.0 - Production on 05-JAN-2011 22:08:56
Copyright (c) 1991, 2009, Oracle.  All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=cd-sashraff.virtusa.com)(PORT=1521)))
TNS-01189: The listener could not authenticate the user
Can somebody help me.
Thank you in advance
Regards, Shaamil

Answer 1

HOSTS FILE
[oracle@cd-sashraff ~]$ cat hostname
cat: hostname: No such file or directory
[oracle@cd-sashraff ~]$ cat /etc/hosts
# Do not remove the following line, or various programs
# that require network functionality will fail.
#127.0.0.1 oel51 localhost.localdomain localhost
127.0.0.1 localhost.localdomain localhost cd-sashraff-vm
::1 localhost6.localdomain6 localhost6
the listener status:
[oracle@cd-sashraff ~]$ lsnrctl stop
LSNRCTL for Linux: Version 11.2.0.1.0 - Production on 05-JAN-2011 22:33:05
Copyright (c) 1991, 2009, Oracle. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=cd-sashraff)(PORT=1521)))
TNS-01189: The listener could not authenticate the user
[oracle@cd-sashraff ~]$ lsnrctl start
LSNRCTL for Linux: Version 11.2.0.1.0 - Production on 05-JAN-2011 22:33:15
Copyright (c) 1991, 2009, Oracle. All rights reserved.
TNS-01106: Listener using listener name LISTENER has already been started
[oracle@cd-sashraff ~]$ lsnrctl stat
LSNRCTL for Linux: Version 11.2.0.1.0 - Production on 05-JAN-2011 22:33:20
Copyright (c) 1991, 2009, Oracle. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=cd-sashraff)(PORT=1521)))
TNS-01189: The listener could not authenticate the user
listener.ora
[oracle@cd-sashraff ~]$ cat /u01/app/oracle/product/11.2.0/db_1/network/admin/listener.ora
# listener.ora Network Configuration File: /u01/app/oracle/product/11.2.0/db_1/network/admin/listener.ora
# Generated by Oracle configuration tools.
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = cd-sashraff)(PORT = 1521))
ADR_BASE_LISTENER = /u01/app/oracle