FIM Password Self service Registration

Hi Team, When we are trying to access non-browser-based SSPR Registration ,it throws an exception requesting us to contact system administrator.But if we try the same in IE, the registration succeeds. FYI, recently we have upgraded from FIM 2010 to FIM 2010 R2. Could you please let me know what could be the root cause of the issue. Thanks and Regards bsivash.