I have already gone through various discussion related to this error but wanted to clarify few of the things that is why this is a separate discussion.
From past 3 days we are facing "Illegal access to viewer, please use valid url" this error at BI Launchpad.
Product : BO Xi 4.0 SP 05 (Enterprise)
When i go through SAP Note 1800752, as it states "restart the Tomcat server", we have already done it. It solves this problem temporarily. After restarting tomcat hardly for half an hour problem gets solved but again that error starts appearing.
Few additional points :
There is no license issue as i am able to login into Webi Rich Client as well as BI Launch pad. Error starts appearing when i view any report from BI Launchpad.
Also, i am able to open report in Webi Rich Client and able to refresh the report as well.
Anyone faced this similar issue? I am not able to find the Root cause of this problem and not able to find any permanent solution.