Installing EM12c: Installer can't find database host name....?

Question

Hello all,
I'm trying to install EM12c. I'm near the last steps, alll requirements passed.
I have a fresh install of 11.2.0.3 database on a second host, listening for connections.
But the EM12c installer keeps error'ing out saying it cannot find the host name for the database server.
I can ping that same server name (I've quadruple checked to make sure it is right)....I've cut from the installer and pasted into a ssh session both as root and oracle user on the target GRID/EM install server...it pings just fine.
ON the database server, I've done tnsping..and it shows listener is up, I've entered valid ports and host name.
ON the target EM server, I've even entered in the /etc/hosts file...the IP and server name....still to no avail.
Any suggestions out there on what else to check? I have downloaded and using the latest EM12c install media...I downloaded it about 2x weeks ago...so, should be latest patched version.
Thanks in advance,
cayenne
ps. Sorry...both EM and database server are on RHEL5 These are VMWare VMs....

Answer 1

mnazim wrote:
Please paste the listener status and paste the value that you have entered at database connection screen.Ok.
I'm having to edit out the actual server and SID names, but they do match:
[oracle@servername ~]$ lsnrctl status
LSNRCTL for Linux: Version 11.2.0.3.0 - Production on 03-MAY-2012 14:45:12
Copyright (c) 1991, 2011, Oracle. All rights reserved.
Connecting to (ADDRESS=(PROTOCOL=tcp)(HOST=)(PORT=1521))
STATUS of the LISTENER
Alias LISTENER
Version TNSLSNR for Linux: Version 11.2.0.3.0 - Production
Start Date 02-MAY-2012 19:05:49
Uptime 0 days 19 hr. 39 min. 24 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File /u01/app/11.2.0/grid/network/admin/listener.ora
Listener Log File /u01/app/oracle/diag/tnslsnr/servername/listener/alert/log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=servername.domain.name)(PORT=1521)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC1521)))
Services Summary...
Service "instance.domain.name" has 1 instance(s).
Instance "instance", status READY, has 1 handler(s) for this service...
Service "instanceXDB.domain.name" has 1 instance(s).
Instance "instance", status READY, has 1 handler(s) for this service...
The command completed successfully
The connection info on the EM12c Installer screen,
Database Host Name: servername.domain.name
Port : 1521
Service/SID: instance (Note, I've tried this with instance name simple and with FQDN attached, same error)
SYS Password: *************
Thank you,
cayenne