Configuring SSO Vintela in cluster

Hi all,

i've configured the SSO between a cluster and all is good.

Now there's a LB in front.

When I call the LB http://LB.FQDN:port/BOE/BI

the SSO doesn't work anymore.

The BI LaunchPad show me the logon page.

Once I login the page show me an error:

Image may be NSFW.
Clik here to view.

i don't find any sap note who could help me.

Anybody have an idea?

regards

Paolo