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3.1.4.2 LsRequestSecurityToken

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When the client is serving as a proxy for an STS in the Requestor STS role described in [MS-MWBF], the client MUST emit an <LsRequestSecurityToken> request message after it authenticates a new web browser requestor requesting a security token using the protocol described in [MS-MWBF]. A new web browser requestor is a web browser requestor that does not present an [RFC2965] session cookie issued by the STS with its security token request.

If a session cookie is presented by the web browser requestor, the client MAY emit an <LsRequestSecurityToken> request message or an <LsRequestSecurityTokenWithCookie> request message, given that no token has been posted in the wresult parameter described by [MS-MWBF].<3>