DominoService and TrustedCerts

I have a portlet that make a connection to a domino server by using a DominoService from lotus colloaboration API. However, it always try to use a secure connection, which require me to put trustedcerts.class into portal library.

My question is, how can we guarantee when we make a connection using domino service, it does not use the secure connection. I have try to disable the SSL connection in diiop port in domino, but it still wants me to put trustedcerts.class.

Thanks a lot for your help and advice.

Kind Regards,

Hans