[TYPO3] Realurl index problem

[Debajit]

Hi list,
i have a typo3 instalation where i installed the realurl plugin but it 
renders a error in frontend "The requested page does not exist!" 
offcource my root page name(alias) is index.it work's fine with any 
other name viz. index0, inde, However when i type mydomain/index.html it 
shows this error,Also it shows nothing in the speaking realurl management.
please help!

Thanks & Regards,
Debajit