/mcpTroubleshoot Common Issues with Certificate Renewal in CUCM Introduction This document describes common issues after regenerate certificates in Cisco Unified Communications Manager (CUCM) and how to resolve them. Prerequisites Requirements Cisco recommends that you have knowledge of these topics: CUCM certificate renewal process • CUCM GUI interface • Expressway servers • Device registration with CUCM process • Certificate Authority Proxy Function • Security Guide for Cisco Unified Communications Manager • Components Used The information in this document is based on these software and hardware versions: CUCM version 15 • The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If your network is live, ensure that you understand the potential impact of any command. Business Impact This table displays the business impact of each certificate renewal in your operation. Review the information carefully. Renew required certificates after hours or in quiet periods, based on the risk level of each certificate.