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ION Service Error

I am seeing this error in ION Service, service node in Grid Application. I restarted the ion service but this error occurs again.

I am not able to send out the email with the notification in workflow. I am triggering the workflow in activation policy. I get the notification in the mingle task but I do not receive the actual email.

2018-06-07 20:31:47,123 +0000Z {} ERROR QueueModule                            Could not accept connection from tcp:// Received fatal alert: certificate_unknown

Anyone knows what is this error is about?