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For a more detailed explanation of details and interactions needed to accomplish this multi-tier authentication, please refer to this page in the Internet2 Wiki.
To get delegated SAML Authentication working please follow the instructions outlined in Configuring uPortal to
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pass the SAML Assertion. Once uPortal has been correctly configured reading up on using the Web Proxy Portlet
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with Shibboleth Delegated Authentication and developing a custom portlet using the Delegated Authentication Integration Library should be read depending on the need.