Hi Manoj,
as far as I understand the error message correctly, the certificate contained in the keystore cannot be validated down to an issuer CA in a truststore.
Default truststore is always the cacerts file in the jre/lib/security directory of your jvm.
Additional root and/or inetermediate CA certificates should stored in a separate truststore which need to be imported to IS keystore configuration.
Can you provide some screenshots from your IS Admin UI for the “Security → Keystores” and “Seurity → Certificates” section?
Regards,
Holger
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