Cannot access Oracle Enterprise Manager via Foxfire

I got to the DBSNMP user and entered the default password of DBSNMP but an error is returned:
ORA-01034: ORACLE not available

how do I fix this so I can continue?

I found it out on the "net"   enter "password"   and it will work? (http://blog.vpire.com/?p=952)

I'll let you know if it worked.

The emcl started but stopped in the middle with an error:
oracle.sysman.emcp.EMconfig perform
SEVERE: Database instance unavailable
Could not complete the configuration.

I did some research and found that I need to start the listener and db instance - which makes sense!
lsnrctl start
Then
sqlplus /nolog
conn sys/password as sysdba
sql>startup
Database mounted and opened.

SO, I tried the $ORACLE_HOME/bin/emca -config dbcontrol d -repos recreate. I am still receiveing an error SEVERE: Listener is not up. Start the Listener and run EM Config Ass. again.  I re-ran the lsnrctl start again and it says "already running". What is happening??

The emca log has the following : Config: ORA -12541 TNS no listener.

Then start the Listener

lsnrctl start
lsnrctl status

I tried to start the listener but get a message "TNS-01106: Listener using listener name LISTENER has already been started  
When I enter lisnrctl status I get:
Connecting to (DESCRIPTION=(ADDRESS=(Protocol=IPC)(KEY=EXTPROC1)))
TNS-12541 : TNS: no listener
TNS-12560 TNS:protocol adapter error
TNS-00511: No listener
Linux ERRoR:2. No such file or directory
Connecting to (DESCRIPTION ADDRESS PROTOCOL=TCP HOST=localhost (PORT=1521))))
STATUS of LISTENER
...
Listener Parameter File /u01/app/oracle/product/11.1.0/db_1/network/admin/listener.ora
...
listening endpoints summary
     Description address protocol =ipc KEY=EXTPROC1521))))
     Description address protocol=tcp HOST=127.0.0.1)(PORT=1521))))
The listener supports no services
the command completed successfully

Could you give me some advice on the listener.ora, TNSNAMES.ora and SQLNET.ora and how they should be set up when a hostname is changed? I think this is where I am encountering a lot of the errors.

THAnks, MISsymadi

There is nothing special.
1. Go to the network component of Linux and change the host settings there.
   In every distribution of Linux there are different utilities that do this.
   Restart the machine and check if it is visible.

2. Go to LISTENER.ORA and edit the HOST = with the new host name

 ......

LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
      (ADDRESS = (PROTOCOL = TCP)(HOST = fsjk.bg.post.int)(PORT = 1521))
    )
  )

3. Start Listener as Oracle user

I'm not sure by what you mean about network component of Linux - do you mean the etc/sysconfig and etc/hosts files?

There are GUIs that put the changed computer name and/or IP in many config files.
In Novel Linux the tool is called YAST2. I do not know what is your distribution.
But find on the Google the name of the GUI.
Otherwise find a description in which files to put the values.

I put the values in the files, etc/sysconfig and etc/hosts file.
Now when I run emca I get "SEVERE, failed to allocate ports in the specified range.....oracle:sysman.emcp.exception failed to allocate ports in the specified range for the following processes JMS, RMI, DBCONTROL 5500-5519

How do I fix this?

Read the installation manual
There is a parameter
portlist range

that should be set appropriatelly.
But I point you the whole document because I suspect other parameters
are not set good enough.

Also look for firewalls, antiviruses

For Red Hat
 
Configure the kernel.
Edit /etc/sysctl.conf.
Add the following to the file:
# Kernel paramaters required by Oracle 11gR1
fs.file-max = 6553600
kernel.shmall = 2097152
kernel.shmmax = 2147483648
kernel.shmmni = 4096
kernel.sem = 250 32000 100 128
net.ipv4.ip_local_port_range = 1024 65000
net.core.rmem_default = 4194304
net.core.rmem_max = 4194304
net.core.wmem_default = 262144
net.core.wmem_max = 262144
                                              

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I followed the installation manual and passed the settings as "succeeded" during install of Oracle 11g. No firewalls or antivirus is blocking the ports.
ANy other ideas?

I tried to run the EMCP but it still fails on the port error. The exact error is
ORACLE: sysman.emcp.exception Failed to allocate ports in the specified range for the following process JMS, RMI, DBCONTROL 5500-5519, EM Agent 3938.

How do I fix this?
The sysctl.conf file reads net.ipv4.ip_local_port_range=1024 6500

I found the error. I had built this on a VM then moved it to another server. BUT I still had my IP address for the VM in etc/hosts file. Once I removed the ip address and let DNS take over in the new environment, Oracle Enterprise Manager opened.