Later i found and configured singer certificate, By retrieveing the certificate information using host name and port number. I saved this new singer certificate and after that i didnt get that exception.
But the problem is in some websphere am able to do this and in some am not able to do. In other am getting this error : "DerInputStream.getLength(): lengthTag=127, too big."
So here is my question why am not able to configure in other websphere, what could be the reason? am doing it in wrong way?