Upgrade fails (11.0.3 to 15.1.0) : Address already in use

Hello,

I have installed the last version of Keycloak (upgrade 11.0.3 to 15.1.0), copied standalone.xm and keycloak.jks, then I execute bin/jboss-cli.sh --file=bin/migrate-standalone.cli.
So, when I execute standalone.sh, I have this error and I don’t find why :

ERROR [org.jboss.msc.service.fail] (MSC service thread 1-4) MSC000001: Failed to start service org.wildfly.undertow.listener.default: org.jboss.msc.service.StartException in service org.wildfly.undertow.listener.default: Address already in use /XXX.XXX.XXX.XXX:8443
at org.wildfly.extension.undertow@23.0.2.Final//org.wildfly.extension.undertow.ListenerService.start(ListenerService.java:209)
at org.jboss.msc@1.4.12.Final//org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1739)
at org.jboss.msc@1.4.12.Final//org.jboss.msc.service.ServiceControllerImpl$StartTask.execute(ServiceControllerImpl.java:1701)
at org.jboss.msc@1.4.12.Final//org.jboss.msc.service.ServiceControllerImpl$ControllerTask.run(ServiceControllerImpl.java:1559)
at org.jboss.threads@2.4.0.Final//org.jboss.threads.ContextClassLoaderSavingRunnable.run(ContextClassLoaderSavingRunnable.java:35)
at org.jboss.threads@2.4.0.Final//org.jboss.threads.EnhancedQueueExecutor.safeRun(EnhancedQueueExecutor.java:1990)
at org.jboss.threads@2.4.0.Final//org.jboss.threads.EnhancedQueueExecutor$ThreadBody.doRunTask(EnhancedQueueExecutor.java:1486)
at org.jboss.threads@2.4.0.Final//org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1377)
at java.base/java.lang.Thread.run(Thread.java:829)

When I check netstat -tulpn, nothing is using the port 8443 until I try to execute Keycloak.

Is there anybody who can help me ?

Thanks in advance

Noone who can help me ?