wso2 or vaadin people I follow this guide to setup ELB for WSO2 Application Server http://docs.wso2.org/wiki/display/ELB203/Setup+ELB+with+WSO2+Application+Server
The ELB works perfectly. However, My vaadin application show this error.
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Vaadin related commit link. http://dev.vaadin.com/changeset/11570/svn
It should be some problem related to session/cookie.
I am willing to provide more information if needed
It turns out the bug is fixed in wso2 svn trunk but not in lastest ELB/ESB. I get two JSESSIONID cookie, thats why passthrough proxy fails. Hope it helps someone.