Email Report link Doesn't work with SSO(Single sign on)

[sravs]

Hi,

we have SSO configuration for our cognos and UI.
when I send a report email link (XXXXXXXXXXXXXXXXXXXXXXXX/cognos.cgi?b_action=cognosViewer&ui.action=run&ui.object=%2fcontent%2fpackage%5b%40xxx%3d%27xxxx%20classification%2xxxxxx%27%5d%2fxxxxx%5b%40xxxxx%3d%27xxxxx%20Ixxx%20xxxxx%20Cxxxxxxxx%20by%20xxxxxl%20xxxx%27%5d&run.outputFormat=HTML&run.outputLocale=)  to the user he gets the below error untill he logs into UI.once he logs into UI and then enter the same link in other window he can see the report.  can anyone please help me out in this.. Do i need to change anythig from cognos???????
The website cannot display the page
HTTP 500 
   Most likely causes:
•The website is under maintenance.
•The website has a programming error.

   What you can try:
     Refresh the page.
     Go back to the previous page.