How to resolve ERR_NAME_NOT_RESOLVED afer Angular upgrade to version 18

I'm working on a Java 17 web app with Angular 13 front end. Java is running in Docker. I've managed to migrate Angular to version 17 without problems, but after upgrading to version 18 and resolving all compilation errors the app compiles correctly but all I see in the browser console is a long list of ERR_NAME_NOT_RESOLVED. How can I solve that issue?

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