I am new to liferay 5.1 technology.
I by mistake removed the login portlet and now I am not able to login into the application.
I mean login portlet is no more visible any help would be of great help.
Can you please try hitting the following url?
localhost:8080/c/portal/login
Replace host and port with your host and port number.
If it doesnt work out try doing the following.(Make sure the package is correct as i am not aware of package path in 5.1)
http://www.liferay.com/community/forums/-/message_boards/message/5005621