If you receive an error during installation of Cisco Unity Connection, do the following:

• Check if you are meeting the platform requirements mentioned in Cisco Unity Connection 12.x Supported Platforms List at https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/connection/12x/supported_platforms/b_12xcucspl.html.

• Make sure that you have met the software requirements mentioned in System Requirements for Cisco Unity Connection Release 12.x at https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/connection/12x/requirements/b_12xcucsysreqs.html.

• Check if the problem is because of SELinux mode on publisher server during the installation of a subscriber server. See Troubleshooting SELinux Issues section.

• Review install logs to diagnose the problem. You can use CLI command or RTMT to collect installation logs. For more information on collecting logs from CLI command, see “file get” section of the “File Commands” chapter of the applicable Command Line Interface Reference Guide for Cisco Unified Communications Solutions. For information on collecting logs from RTMT, see the “Collect Installation Logs” section of the “Traces and Logs” chapter of the applicable Cisco Unified Real-Time Monitoring Tool Administration Guide. You can locate both the guide at http://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/products-maintenance-guides-list.html.

  Note	If you receive any error while installing the subscriber server, you can review the install logs of the subscriber server to troubleshoot the problem.

• Contact Cisco TAC if you are not able to resolve the issue.

Following are the issues that you might face while upgrading from one version of Unity Connection to another:

• Switch Version Failures: To troubleshoot the switch version failures as a part of upgrade from Unity Connection 8.6 to a later version, verify whether the problem is caused by SELinux security policies. For more information, see the Troubleshooting SELinux Issues section. You can also review install logs for upgrade failure. For more information on how to collect install logs, see applicable Command Line Interface Reference Guide for Cisco Unified Communications Solutions and Cisco Unified Real-Time Monitoring Tool Administration Guide at http://www.cisco.com/c/en/us/support/unified-communications/unified-communications-manager-callmanager/products-maintenance-guides-list.html.

  Note	Make sure to run pre upgrade CLI to verify if the system is good to upgrade.