Receiving Dell EMC Isilon Add on cert verify error

Building for the Splunk Platform

We configured the EMC Isilon addon on our heavy forwarder, It is throwing the authentication error when we try to connect to any Isilon cluster node.
We are able to connect to same Isilon cluster nodes from web UI with given user and password.

Here are the log errors we are getting

Any help here is really appreciated!!!!!!!!!

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