CUCM install was fairly easy, but first time booting the CUCM system. We got below errors. Few suggestion was found in the forum and VoIP expert site, but here is the one fixed out issue
HTTP Status 404 – /ccmadmin/showHome.do
Login in to the CUCM system and make sure all the essential services are running by CLI.
Admin: utils service list page
Try to restart Cisco Tomcat service by following command. Usually, that fixed the above issue.
Admin: utils service start Cisco Tomcat
I hope it is informative for you.