SAML response error: No return endpoint available for relying party

[Peter Schober]

* jfu <jfu_gengyue at hotmail.com> [2013-12-07 01:00]:
> is it supposed to be this way? I mean if we see this kind of error,
> should there be no traffic to SP? or something is wrong with our
> IDP? is there no connection between SP and us?

With the current IDP there will be no direct connection to SP, ever.
Your web browser is what connects to both the IdP and SP, and mediates
messages between them. So no traffic from the IdP to the SP during
login is to be exected.
Check the UnderstandingShibboleth docs in the wiki.
-peter