Is this is a windows server? If yes, have you installed the certificate in both root and intermediate? start->run->mmc->file->add/remove snap-in->certificates->add->computer account ->local computer -> ok -> expand certificates -> expand trusted root -> click certificates -> is the cert there? if not import it -> right click certificate -> All tasks import browse out to where the certificate is located. -> click Intermediate Certificate -> certificates -> is the cert there? if not import it -> right click certificate -> All tasks import browse out to where the certificate is located.
Close the Console. Don't Save.