Is it the cert trust or other aspect of the validation? Your IT guys should have the CA cert for the appliance that is signing these available to add to your l

Is it the cert trust or other aspect of the validation? Your IT guys should have the CA cert for the appliance that is signing these available to add to your local cert store. The CA cert may be attached to the server cert you are presented too. Just extract that and add it to wherever linux keeps its certs.