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My oracle express edition was working some months earlier.

I dont know what i changed in the system, now I could not connect to it. I tried logging in from sqlplus as sysdba and altered the accounts to unlock, grant connect and resource privileges but I couldn't connect to database through sqltool.

I checked the listener.ora file where the host was Rajan. Ping on Rajan is working(pointing to localhost).

Error for lsnrctl

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What operating system are you running? (Windows XP/7/8? 32 or 64-bit?) –  Phil Feb 8 at 8:30

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TNS-12541: TNS:no listener

Error message is self-explanatory, the listener is not running, so start the listener with "lsnrctl start". Since you are on Windows, it runs as a service, so you can start the service itself.

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