Am running NT 4.0 with Exchange Server 5.5 and IIS4. I have loaded the Key Management Server and the Certificate Server and have reloaded SP6 after this. The Certificate Authority does not start. In the event viewer the codes are 7000 and 7009. I can get the Certificate Authority to run on our Proxy Server in a shared folder, but Exchange does not see it even after installing Web Client. Anyone got any ideas??