Enterprise Manager : Failed To Allocate Port (error At End Of Installation) , ORA-00119 ,ORA-00130 and enterprise manager configuration failed due to the following error - null

 1. I am running DBCA and I am getting this ORA-00119 error:

Need to change the hostname to localhost.localdomain

 $  hostname localhost.localdomain

Check service iptables status if runing then stop

then stop the iptables

server iptables stop

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2. Enterprise manager configuration failed due to the following error

check  these parameter in the respective config files  and try again:

vi /etc/sysctl.conf

kernel.shmall = 268435456

fs.suid_dumpable = 1

fs.aio-max-nr = 1048576

fs.file-max = 6815744

kernel.shmall = 2097152

kernel.shmmax = 536870912

kernel.shmmni = 4096

kernel.sem = 250 32000 100 128

net.ipv4.ip_local_port_range = 9000 65500

net.core.rmem_default = 262144

net.core.rmem_max = 4194304

net.core.wmem_default = 262144

NET.CORE.WMEM_MAX = 1048586

vi /etc/security/limits.conf

# End of file

oracle              soft    nproc   2047

oracle              hard    nproc   16384

oracle              soft    nofile  4096

oracle              hard    nofile  65536

oracle              soft    stack   10240

Check the ip of the server:

$ifconfig

192.168.204.128

Check the hostname:

$hostname

localhost.example.com

$vi /etc/hosts

192.168.204.128 localhost.example.com

then reboot the server:

check again iptables that are running or not if running then stop

$ service iptables status

$ service iptables stop

3.  enterprise manager configuration failed due to the following error - null 

Login with the root user:

Check the ip of the server:

$ifconfig

192.168.204.128

Check the hostname:

$hostname

localhost.example.com

$vi /etc/hosts

192.168.204.128 localhost.example.com

Try these. it will help you.

i have tried these...... and give your suggestion if any other way to resolve these issues... and  these step are useful to resolve these problem or not. Kindly  let me know.... 

All The Best....:)