Ashok,
Are you Win AD Auth? Have you tried logging into to CMC to see that is working? What version of Java are you using?, you need to use older version of 1.6
Also Clients using IE 11 is NOT supported with BOE XI 3.1.5, see PAM screenshot below.
I would strongly recommend updating you XI 3.1.5 to SP7 to better support current Browsers and Java.
See below XI 3.1.7 Supported Browser & Java
Regards,
Ajay