Test your content store and validate the URLs in COGNOS configuration. Just check if its properly connected to your contect store and if the IIS part is done properly.
I Think you are using ReportNet 1.1 MR. Cryptography Jar files supports in Microsoft Flatforms upto May 2004. You need to download new jar files from Cognos. Otherwise simply change the system date between Apr 15th 2004 to May 30th 2004. This works perfect.
