Hi @andreas.franke,
To further isolate the issue, can you check which URL on the console is this error occurring for? After that, compare it with the SSO URL in the header.script.init.ftl file. Note that the base URL has to be exactly the same, i.e. if the server is accessed via http://cognos01, then the url in the FTL file should have like http://cognos01 and not http://cognos01:80 .
The other area to check possibly is if the xdomain.canvas.html/js file in the Cognos BI server is accessible from the user’s PC. It might have been a security update prevents access for them. You can try to test this out from the browser and type http://cognos01/xdomain.canvas.html for example.
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Paul
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Paul