The SOI Manager details such as Hostname, Port and password etc are stored in ...
2) "\Catalyst\CatalystConnector\registry\topology\physical\<Node name>_CatalystConnector\ifw\eventManagementServer.properties"
3) "\Catalyst\CatalystConnector\registry\topology\physical\<Node name>_CatalystConnector\<Nodename>_CatalystConnector-config.xml"
If you want to point it to other SOI Host you will need to update these files with the new server host name details and restart "CA Catalyst Container" services.
Note: Please delete all files inside "\CatalystConnector\container\registry-cache" folder before starting "CA Catalyst Container" services
Note: If you also have a password change, you will need to generate an encrypted password by using the "\CatalystContainer\ifw\EncryptSAMCreds.bat" and update the above file with the new password