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

anuptiwary at
Thu Jul 26 06:31:03 EDT 2018

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)


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 <> 

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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