For Certificate Authority to support the Online Responder service, we need to add the location of the Online Responder to the authority information access extension of issued certificates and enable the certificate templates. Requirement: IIS service is required. You will be prompted to install IIS during setup. Setup Guide: 1. Install Online Response Service – Click Start - Administrative Tools - click Server Manager – Expand Roles - right-click Active Directory Certificate Services - click Add role services – On the Select Role Services page - select the Online Responder check box - You are prompted to install IIS and Windows Activation Service - click Add Required Role Services - click Next – Click Next on Web Server IIS - On Select Role Services - click Next – On the Confirm Installation Selections page - click Install – When the installation is complete - Review the status page to verify that the installation was successful - click Close Note: During the setup process, a virtual directory named OCSP is created in IIS, and the ISAPI extension used as the Web proxy is registered.