Recently, many user authentication schemes with bilinear pairings have been proposed for client-server environment. In 2009, Goriparthi et al. proposed an improved bilinear pairing based remote user authentication scheme. Goriparthi et al. claimed that the improved scheme can withstand replay, forgery and insider attacks. However, this paper shows that the improved scheme is not only insecure against off-line password guessing, remote server impersonation, Denial of Service, and insider attacks, but also has mutual authentication problem.