It seems that cached history of the browser need to be cleared.
Please follow steps given below to resolve the issue:
(1.) Open Internet Explorer and Press Ctrl+Shift+P (All three buttons together). This step would open an in-private session of IE.
(a) Open Internet Explorer,
(b) Go to Tools>Internet Options>General (Tab)>Browsing History (Section),
(c) Check mark the Check-Box mentioning “Delete browsing history on exit”,
(d) Click Apply and OK,
(e) Close all instances of Internet Explorer and
(f) Open a fresh instance of Internet Explorer.
(2.) Go to http://www.cisce.org/helpdesk
(3.) Click User Login Button (located at top right corner)
(4.) Enter user ID and password provided.
It will work.