ORA-12543: TNS:destination host unreachable error

I got this error while I was trying to connect to a remote database on a linux host.

Reason : Firewall was enabled on the target host.

I disabled firewall by issuing following commands :

root@target#service iptables status
            service iptables stop
            chkconfig iptables off

Now I could make the connection.

Hope it helps…

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