Post saml reponse from one shib idp to other shib idp

[dalipcse91]

Hi Team,
I got stranded on one test cases, we are using shibboleth as identity
provider with custom service provider. This service provider can be
authenticated by more than one idp. Right now we have two shibboleth idp.
one is primary idp and second idp is as trust provider in first idp. and
first idp added as trust provider in custom service provider. On primary
IDP's login page, when user enter username, based on username's domain we
create a authn request to particular idp. idp authenticates user and post a
saml response to primary idp's SAML2/POST/SSO location. In response we are
able to see attributes and other details as well. my problem is that primary
idp did not post this saml response(getting from secondary idp) to custom
sp's consuming url. i am getting below error message.
<http://shibboleth.1660669.n2.nabble.com/file/t398613/Capture12.jpg>



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