Help - DPR-ERR-2056 'The Report Server is not responding'

[lily]

I created a report with multiple date range selections on Win env. It is fine both validation and running. After I exported it to the Linux machine, I got DPR-ERR-2056 The Report Server is not responding error when I try to validate it with server. The Win and Linux both have same Cognos 8.1 MR2. The report runs fine for some of the date range, but for other date ranges, I got this DPR-ERR-2056 error. Any ideas?

Thanks.

[nashtrain]

After we finally reproduced the error with basic level logging on, we analyzed the a log by first putting it back in the right order; We realized that the BIBus process failed just after we got a bunch of warnings because cross-product joins was used in the reports that we got the DPR-ERR-2056 error in the portal and the DPR-ERR-2074 error in the cogserver.log file.  A simple change to the FM model governor so that cross-product joins are allowed and republishing the packages seems to do the trick.  We didn't have the error for 3 days now!!! Hope that's it! We are running more than 70 daily reports and we usually get this error 2-3 times every night!