How can we make our server (WebSphere) secure so that the end users using our web application cannot access it , if some haker kind of user attempts to access our server , what security frameworks , security mechanisms are available for online web servers which we should adopt or integrate in our application to make our server more and more secure , if know about some industry standard securty frameworks or techniques which are being used by banks or financial institutes than please suggest.
I would use an encryption software so that potential hackers cannot access your data or software. There are many different ones out there, I would just do some research and Google it and go from there.
I think you need to install SSL. And your users will access to the secure areas through HTTPS protocol