Lately I went into an issue where users recieved a dialog box in outlook saying, there is a problem with the security certificate; The customer is running on Exchange Server 2016 and is using a Kemp Loadbalancer. This MS article; https://support.microsoft.com/da-dk/help/923575/error-message-when-outlook-tries-to-connect-to-a-server-by-using-an-rp states that there is a problem with the security channel Finnaly I found this …