RPSTicket is null

I am trying to get RPSticket via the code below.

RPSTicket ticket = httpAuth.Authenticate(siteDnsName, Request, authPropBag);

While executing this code it gives exception "The siteid does not match with Target Id or audiance"

Can any one tell me what should be possible reasons for the same?

[477 byte] By [INdrajeetKumpavat] at [2008-1-8]

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