It is dump situation where I disable User login module and log out as admin. N permission restricts me to bring back login as admin as no login form is there, On that day I spent couple of minutes trying to access site, N As I fed up that day, had given access permission to anonymous user through database access (I know it is very stupid way to get out of situation) THen on next M'ning I found the solution for that from drupal forum that I can access login page by www.site-name.com?q=user