Pl Ignore my post. I got it working and don't know what fixed the problem. I did few things,
[1] Added this additional,
@EJB(name="AuthenticationRemote", beanInterface=AuthenticationRemote.class)
in my calling Servlet.
[2] Created a package and moved my Servlet under this package.
[3] Restarted the Glassfish.
Now it works!
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