Isqlplus is not working in linux (oracle linux) in graphical mode

I have installed Oracle 9i on Oracle Enterprise Linux.sqlplus is working in text mode .But isqlplus is not running .After installation it was working fine but when i have restarted the system it stopped running..........
Firefox can't establish a connection to the server at oraclelinux.rcc.in:7778.
Error message
* The site could be temporarily unavailable or too busy. Try again in a few
moments.
* If you are unable to load any pages, check your computer's network
connection.
* If your computer or network is protected by a firewall or proxy, make sure
that Firefox is permitted to access the Web.
Please help me
Sanjeev Jha
Message was edited by:
user634063

You have to start Http server for that :
$ $ORACLE_HOME/Apache/Apache/bin/apachectl start

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