10G agent and Database Instance is down

Im install oracle 10G on oracle enterprice linux 4. machine is P4 512 MB ram 3.GZ desktop one. oracle is working fine. but little slow. it is ok.
But few minuts after opening the database, enterprice manager cosole display that agent and Database Instance is down.
Display the following message
""Details The instance has been terminated by a database process because of a fatal internal condition, or a critical background process was killed by the user.""
But oracle is working. select and other this working fine.
Please help me to overcome the problem.
Regrds
upul Indika

Define a fixed IP address for your server. If problem persists then you can use emca-Enterprise Manager Configuration assistance to delete and reconfigure the console.
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abrt-ccpp          0:off    1:off    2:off    3:on    4:off    5:on    6:off
abrtd              0:off    1:off    2:off    3:on    4:off    5:on    6:off
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cpuspeed           0:off    1:on    2:on    3:on    4:on    5:on    6:off
crond              0:off    1:off    2:on    3:on    4:on    5:on    6:off
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dnsmasq            0:off    1:off    2:off    3:off    4:off    5:off    6:off
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ip6tables          0:off    1:off    2:on    3:on    4:on    5:on    6:off
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