It looks like when using -1 as tomcat shutdown port (nuxeo.server.tomcat-admin.port=-1 in nuxeo.conf) configuration check fails. -1 allows to disable the shutdown port and used in this doc.

Here is the exception I get:

Exception in thread “NuxeoProcessThread-0” java.lang.IllegalArgumentException: Invalid port: -1

at org.nuxeo.launcher.config.ConfigurationGenerator.checkPortAvailable(ConfigurationGenerator.java:1355)
at org.nuxeo.launcher.config.TomcatConfigurator.checkNetwork(TomcatConfigurator.java:211)
at org.nuxeo.launcher.config.ServerConfigurator.verifyInstallation(ServerConfigurator.java:586)
at org.nuxeo.launcher.config.ConfigurationGenerator.verifyInstallation(ConfigurationGenerator.java:1237)
at org.nuxeo.launcher.NuxeoLauncher.doStart(NuxeoLauncher.java:1204)
at org.nuxeo.launcher.NuxeoLauncher$1.run(NuxeoLauncher.java:831)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:722)

Also setting nuxeo.force.generation=false still triggers the check, not sure if that's expected.