supplied TrustEngine failed to validate SSL/TLS server certificate - while validating the saml response send by idp to SP

[anuptiwary]

While login through idp login screen user is authenticated (used Apache
directory server for user information) successfully and saml response is
sent from idp to SP at service provider end I getting below error - 

supplied TrustEngine failed to validate SSL/TLS server certificate
...
complete certificated detail(s) e.g.
 Subject Public Key Info:
            Public Key Algorithm: rsaEncryption
                Public-Key: (2048 bit)
                Modulus:
                    00:8a:85:16:56:f2:92:4e:8a:37:79:e1:35:26:25:
                    34:39:65:9f:61:d5:9e:cf:4a:88:09:11:47:8b:86:
                    8b:a5:15:79:55:3f:bf:c9:1e:aa:a0:d2:a4:5d:d2:

.....
.....

ERROR Shibboleth.AttributeResolver.Query [29]: exception during SAML query
to https://localhost:8443/idp/profile/SAML2/SOAP/AttributeQuery:
CURLSOAPTransport failed while contacting SOAP endpoint
(https://localhost:8443/idp/profile/SAML2/SOAP/AttributeQuery): SSL
certificate problem: application verification failure

Below is the HLD diagram for component integration - as I am using httpd
server infront 
me <http://shibboleth.1660669.n2.nabble.com/file/t398706/HLD.png> 

Any help would be much appreciated. I am stuck at same level since long and
not getting any clue, renewed idp certificate multiple time but no success.



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