You can try to find the affected files by searching them for the Address.
For Windows I use BareGrep for similar searches.
Remember that some config is stored in database tables (like MWS does) or in certain config files inside the IS-Packages (WmMonitor, WmTaskClient, WmPRT, WmOptimize, …).
Also check the settings of the Optimize environment in MWS (if used), and redeploy it after modifications.
If the config is stored in database, you will need to detect the propert configuration place (either IS or MWS) to get it changed as this is usually much more easiert than to do in the database directly.
Addtitionally some settings are stored separately for each user, so every user has to do these modifications, i.e. Broker address in MWS.
You should also check for AdapterConnections and JDBC-Pools.