Changing hostnames for Cognos server

If the hostname or IP address is changed, you might run into problems when saving the configuration file.

For example, you may get the following errors:
CAM-CRP-1315 Current configuration points to a different Trust Domain than originally configured.

The way to do it is to try deleting the folders under configuration for csk then in configuration do another save. Some have mentioned that you need to delete the files under encryptkeypair and signkeypair but it didn't work for me - I had to keep them.