After upgrading the Cisco CallManager from 3.1.3a to 3.2.2c, the installation of service pack H fails.
The error message indicates that a connection cannot be established. This connection failure could be caused by network connectivity problems or application issues.
In this case, adding the Structured Query Language (SQL) service name to the hosts, as well as adding the LMHOSTS files of the publisher and subscriber resolves the problem.
For more information, refer to Cisco CallManager: Subscriber Upgrade Fails / Unable to Find Updated Database.