Bind to IPv6 (`http-host`)

Hi,

what’s the correct syntax to have Keycloak 18 bind to IPv6?

I tried

http-host=::
and
http-host=[::]

but both make the program feel very offended:

Output
$ bin/kc.sh start-dev
2022-04-29 00:33:14,816 INFO  [org.keycloak.quarkus.runtime.hostname.DefaultHostnameProvider] (main) Hostname settings: FrontEnd: sweetsuse, Strict HTTPS: false, Path: <request>, Strict BackChannel: false, Admin: <request>, Port: -1, Proxied: false
2022-04-29 00:33:15,511 WARN  [org.infinispan.CONFIG] (keycloak-cache-init) ISPN000569: Unable to persist Infinispan internal caches as no global state enabled
2022-04-29 00:33:15,554 WARN  [org.infinispan.PERSISTENCE] (keycloak-cache-init) ISPN000554: jboss-marshalling is deprecated and planned for removal
2022-04-29 00:33:15,568 INFO  [org.infinispan.CONTAINER] (keycloak-cache-init) ISPN000556: Starting user marshaller 'org.infinispan.jboss.marshalling.core.JBossUserMarshaller'
2022-04-29 00:33:15,736 INFO  [org.infinispan.CONTAINER] (keycloak-cache-init) ISPN000128: Infinispan version: Infinispan 'Triskaidekaphobia' 13.0.8.Final
2022-04-29 00:33:16,098 INFO  [org.keycloak.connections.infinispan.DefaultInfinispanConnectionProviderFactory] (main) Node name: node_660379, Site name: null
2022-04-29 00:33:16,667 ERROR [io.quarkus.vertx.core.runtime.VertxCoreRecorder] (vert.x-eventloop-thread-1) Uncaught exception received by Vert.x: java.lang.IllegalStateException: Result is already complete
        at io.vertx.core.Promise.fail(Promise.java:90)
        at io.quarkus.vertx.http.runtime.VertxHttpRecorder$WebDeploymentVerticle.lambda$setupTcpHttpServer$1(VertxHttpRecorder.java:1077)
        at io.vertx.core.impl.future.FutureImpl$3.onFailure(FutureImpl.java:153)
        at io.vertx.core.impl.future.FutureBase.emitFailure(FutureBase.java:75)
        at io.vertx.core.impl.future.FutureImpl.tryFail(FutureImpl.java:230)
        at io.vertx.core.impl.future.FixedMapping.onFailure(FixedMapping.java:36)
        at io.vertx.core.impl.future.FutureBase.lambda$emitFailure$1(FutureBase.java:69)
        at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:164)
        at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:469)
        at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:503)
        at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:986)
        at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
        at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
        at java.base/java.lang.Thread.run(Thread.java:829)

2022-04-29 00:33:16,668 ERROR [io.quarkus.vertx.core.runtime.VertxCoreRecorder] (vert.x-eventloop-thread-15) Uncaught exception received by Vert.x: java.lang.IllegalStateException: Result is already complete
        at io.vertx.core.Promise.fail(Promise.java:90)
        at io.quarkus.vertx.http.runtime.VertxHttpRecorder$WebDeploymentVerticle.lambda$setupTcpHttpServer$1(VertxHttpRecorder.java:1077)
        at io.vertx.core.impl.future.FutureImpl$3.onFailure(FutureImpl.java:153)
        at io.vertx.core.impl.future.FutureBase.emitFailure(FutureBase.java:75)
        at io.vertx.core.impl.future.FutureImpl.tryFail(FutureImpl.java:230)
        at io.vertx.core.impl.future.FixedMapping.onFailure(FixedMapping.java:36)
        at io.vertx.core.impl.future.FutureBase.lambda$emitFailure$1(FutureBase.java:69)
        at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:164)
        at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:469)
        at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:503)
        at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:986)
        at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
        at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
        at java.base/java.lang.Thread.run(Thread.java:829)

2022-04-29 00:33:16,667 ERROR [io.quarkus.vertx.core.runtime.VertxCoreRecorder] (vert.x-eventloop-thread-8) Uncaught exception received by Vert.x: java.lang.IllegalStateException: Result is already complete
        at io.vertx.core.Promise.fail(Promise.java:90)
        at io.quarkus.vertx.http.runtime.VertxHttpRecorder$WebDeploymentVerticle.lambda$setupTcpHttpServer$1(VertxHttpRecorder.java:1077)
        at io.vertx.core.impl.future.FutureImpl$3.onFailure(FutureImpl.java:153)
        at io.vertx.core.impl.future.FutureBase.emitFailure(FutureBase.java:75)
        at io.vertx.core.impl.future.FutureImpl.tryFail(FutureImpl.java:230)
        at io.vertx.core.impl.future.FixedMapping.onFailure(FixedMapping.java:36)
        at io.vertx.core.impl.future.FutureBase.lambda$emitFailure$1(FutureBase.java:69)
        at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:164)
        at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:469)
        at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:503)
        at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:986)
        at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
        at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
        at java.base/java.lang.Thread.run(Thread.java:829)

2022-04-29 00:33:16,667 ERROR [io.quarkus.vertx.core.runtime.VertxCoreRecorder] (vert.x-eventloop-thread-10) Uncaught exception received by Vert.x: java.lang.IllegalStateException: Result is already complete
        at io.vertx.core.Promise.fail(Promise.java:90)
        at io.quarkus.vertx.http.runtime.VertxHttpRecorder$WebDeploymentVerticle.lambda$setupTcpHttpServer$1(VertxHttpRecorder.java:1077)
        at io.vertx.core.impl.future.FutureImpl$3.onFailure(FutureImpl.java:153)
        at io.vertx.core.impl.future.FutureBase.emitFailure(FutureBase.java:75)
        at io.vertx.core.impl.future.FutureImpl.tryFail(FutureImpl.java:230)
        at io.vertx.core.impl.future.FixedMapping.onFailure(FixedMapping.java:36)
        at io.vertx.core.impl.future.FutureBase.lambda$emitFailure$1(FutureBase.java:69)
        at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:164)
        at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:469)
        at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:503)
        at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:986)
        at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
        at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
        at java.base/java.lang.Thread.run(Thread.java:829)

2022-04-29 00:33:16,668 ERROR [io.quarkus.vertx.core.runtime.VertxCoreRecorder] (vert.x-eventloop-thread-3) Uncaught exception received by Vert.x: java.lang.IllegalStateException: Result is already complete
        at io.vertx.core.Promise.fail(Promise.java:90)
        at io.quarkus.vertx.http.runtime.VertxHttpRecorder$WebDeploymentVerticle.lambda$setupTcpHttpServer$1(VertxHttpRecorder.java:1077)
        at io.vertx.core.impl.future.FutureImpl$3.onFailure(FutureImpl.java:153)
        at io.vertx.core.impl.future.FutureBase.emitFailure(FutureBase.java:75)
        at io.vertx.core.impl.future.FutureImpl.tryFail(FutureImpl.java:230)
        at io.vertx.core.impl.future.FixedMapping.onFailure(FixedMapping.java:36)
        at io.vertx.core.impl.future.FutureBase.lambda$emitFailure$1(FutureBase.java:69)
        at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:164)
        at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:469)
        at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:503)
        at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:986)
        at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
        at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
        at java.base/java.lang.Thread.run(Thread.java:829)

2022-04-29 00:33:16,668 ERROR [io.quarkus.vertx.core.runtime.VertxCoreRecorder] (vert.x-eventloop-thread-5) Uncaught exception received by Vert.x: java.lang.IllegalStateException: Result is already complete
        at io.vertx.core.Promise.fail(Promise.java:90)
        at io.quarkus.vertx.http.runtime.VertxHttpRecorder$WebDeploymentVerticle.lambda$setupTcpHttpServer$1(VertxHttpRecorder.java:1077)
        at io.vertx.core.impl.future.FutureImpl$3.onFailure(FutureImpl.java:153)
        at io.vertx.core.impl.future.FutureBase.emitFailure(FutureBase.java:75)
        at io.vertx.core.impl.future.FutureImpl.tryFail(FutureImpl.java:230)
        at io.vertx.core.impl.future.FixedMapping.onFailure(FixedMapping.java:36)
        at io.vertx.core.impl.future.FutureBase.lambda$emitFailure$1(FutureBase.java:69)
        at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:164)
        at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:469)
        at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:503)
        at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:986)
        at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
        at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
        at java.base/java.lang.Thread.run(Thread.java:829)

2022-04-29 00:33:16,668 ERROR [io.quarkus.vertx.core.runtime.VertxCoreRecorder] (vert.x-eventloop-thread-2) Uncaught exception received by Vert.x: java.lang.IllegalStateException: Result is already complete
        at io.vertx.core.Promise.fail(Promise.java:90)
        at io.quarkus.vertx.http.runtime.VertxHttpRecorder$WebDeploymentVerticle.lambda$setupTcpHttpServer$1(VertxHttpRecorder.java:1077)
        at io.vertx.core.impl.future.FutureImpl$3.onFailure(FutureImpl.java:153)
        at io.vertx.core.impl.future.FutureBase.emitFailure(FutureBase.java:75)
        at io.vertx.core.impl.future.FutureImpl.tryFail(FutureImpl.java:230)
        at io.vertx.core.impl.future.FixedMapping.onFailure(FixedMapping.java:36)
        at io.vertx.core.impl.future.FutureBase.lambda$emitFailure$1(FutureBase.java:69)
        at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:164)
        at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:469)
        at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:503)
        at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:986)
        at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
        at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
        at java.base/java.lang.Thread.run(Thread.java:829)

2022-04-29 00:33:16,667 ERROR [io.quarkus.vertx.core.runtime.VertxCoreRecorder] (vert.x-eventloop-thread-6) Uncaught exception received by Vert.x: java.lang.IllegalStateException: Result is already complete
        at io.vertx.core.Promise.fail(Promise.java:90)
        at io.quarkus.vertx.http.runtime.VertxHttpRecorder$WebDeploymentVerticle.lambda$setupTcpHttpServer$1(VertxHttpRecorder.java:1077)
        at io.vertx.core.impl.future.FutureImpl$3.onFailure(FutureImpl.java:153)
        at io.vertx.core.impl.future.FutureBase.emitFailure(FutureBase.java:75)
        at io.vertx.core.impl.future.FutureImpl.tryFail(FutureImpl.java:230)
        at io.vertx.core.impl.future.FixedMapping.onFailure(FixedMapping.java:36)
        at io.vertx.core.impl.future.FutureBase.lambda$emitFailure$1(FutureBase.java:69)
        at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:164)
        at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:469)
        at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:503)
        at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:986)
        at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
        at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
        at java.base/java.lang.Thread.run(Thread.java:829)

2022-04-29 00:33:16,668 ERROR [io.quarkus.vertx.core.runtime.VertxCoreRecorder] (vert.x-eventloop-thread-13) Uncaught exception received by Vert.x: java.lang.IllegalStateException: Result is already complete
        at io.vertx.core.Promise.fail(Promise.java:90)
        at io.quarkus.vertx.http.runtime.VertxHttpRecorder$WebDeploymentVerticle.lambda$setupTcpHttpServer$1(VertxHttpRecorder.java:1077)
        at io.vertx.core.impl.future.FutureImpl$3.onFailure(FutureImpl.java:153)
        at io.vertx.core.impl.future.FutureBase.emitFailure(FutureBase.java:75)
        at io.vertx.core.impl.future.FutureImpl.tryFail(FutureImpl.java:230)
        at io.vertx.core.impl.future.FixedMapping.onFailure(FixedMapping.java:36)
        at io.vertx.core.impl.future.FutureBase.lambda$emitFailure$1(FutureBase.java:69)
        at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:164)
        at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:469)
        at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:503)
        at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:986)
        at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
        at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
        at java.base/java.lang.Thread.run(Thread.java:829)

2022-04-29 00:33:16,668 ERROR [io.quarkus.vertx.core.runtime.VertxCoreRecorder] (vert.x-eventloop-thread-4) Uncaught exception received by Vert.x: java.lang.IllegalStateException: Result is already complete
        at io.vertx.core.Promise.fail(Promise.java:90)
        at io.quarkus.vertx.http.runtime.VertxHttpRecorder$WebDeploymentVerticle.lambda$setupTcpHttpServer$1(VertxHttpRecorder.java:1077)
        at io.vertx.core.impl.future.FutureImpl$3.onFailure(FutureImpl.java:153)
        at io.vertx.core.impl.future.FutureBase.emitFailure(FutureBase.java:75)
        at io.vertx.core.impl.future.FutureImpl.tryFail(FutureImpl.java:230)
        at io.vertx.core.impl.future.FixedMapping.onFailure(FixedMapping.java:36)
        at io.vertx.core.impl.future.FutureBase.lambda$emitFailure$1(FutureBase.java:69)
        at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:164)
        at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:469)
        at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:503)
        at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:986)
        at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
        at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
        at java.base/java.lang.Thread.run(Thread.java:829)

2022-04-29 00:33:16,668 ERROR [io.quarkus.vertx.core.runtime.VertxCoreRecorder] (vert.x-eventloop-thread-7) Uncaught exception received by Vert.x: java.lang.IllegalStateException: Result is already complete
        at io.vertx.core.Promise.fail(Promise.java:90)
        at io.quarkus.vertx.http.runtime.VertxHttpRecorder$WebDeploymentVerticle.lambda$setupTcpHttpServer$1(VertxHttpRecorder.java:1077)
        at io.vertx.core.impl.future.FutureImpl$3.onFailure(FutureImpl.java:153)
        at io.vertx.core.impl.future.FutureBase.emitFailure(FutureBase.java:75)
        at io.vertx.core.impl.future.FutureImpl.tryFail(FutureImpl.java:230)
        at io.vertx.core.impl.future.FixedMapping.onFailure(FixedMapping.java:36)
        at io.vertx.core.impl.future.FutureBase.lambda$emitFailure$1(FutureBase.java:69)
        at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:164)
        at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:469)
        at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:503)
        at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:986)
        at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
        at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
        at java.base/java.lang.Thread.run(Thread.java:829)

2022-04-29 00:33:16,667 ERROR [io.quarkus.vertx.core.runtime.VertxCoreRecorder] (vert.x-eventloop-thread-0) Uncaught exception received by Vert.x: java.lang.IllegalStateException: Result is already complete
        at io.vertx.core.Promise.fail(Promise.java:90)
        at io.quarkus.vertx.http.runtime.VertxHttpRecorder$WebDeploymentVerticle.lambda$setupTcpHttpServer$1(VertxHttpRecorder.java:1077)
        at io.vertx.core.impl.future.FutureImpl$3.onFailure(FutureImpl.java:153)
        at io.vertx.core.impl.future.FutureBase.emitFailure(FutureBase.java:75)
        at io.vertx.core.impl.future.FutureImpl.tryFail(FutureImpl.java:230)
        at io.vertx.core.impl.future.FixedMapping.onFailure(FixedMapping.java:36)
        at io.vertx.core.impl.future.FutureBase.lambda$emitFailure$1(FutureBase.java:69)
        at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:164)
        at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:469)
        at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:503)
        at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:986)
        at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
        at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
        at java.base/java.lang.Thread.run(Thread.java:829)

2022-04-29 00:33:16,667 ERROR [io.quarkus.vertx.core.runtime.VertxCoreRecorder] (vert.x-eventloop-thread-9) Uncaught exception received by Vert.x: java.lang.IllegalStateException: Result is already complete
        at io.vertx.core.Promise.fail(Promise.java:90)
        at io.quarkus.vertx.http.runtime.VertxHttpRecorder$WebDeploymentVerticle.lambda$setupTcpHttpServer$1(VertxHttpRecorder.java:1077)
        at io.vertx.core.impl.future.FutureImpl$3.onFailure(FutureImpl.java:153)
        at io.vertx.core.impl.future.FutureBase.emitFailure(FutureBase.java:75)
        at io.vertx.core.impl.future.FutureImpl.tryFail(FutureImpl.java:230)
        at io.vertx.core.impl.future.FixedMapping.onFailure(FixedMapping.java:36)
        at io.vertx.core.impl.future.FutureBase.lambda$emitFailure$1(FutureBase.java:69)
        at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:164)
        at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:469)
        at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:503)
        at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:986)
        at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
        at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
        at java.base/java.lang.Thread.run(Thread.java:829)

2022-04-29 00:33:16,669 ERROR [io.quarkus.vertx.core.runtime.VertxCoreRecorder] (vert.x-eventloop-thread-12) Uncaught exception received by Vert.x: java.lang.IllegalStateException: Result is already complete
        at io.vertx.core.Promise.fail(Promise.java:90)
        at io.quarkus.vertx.http.runtime.VertxHttpRecorder$WebDeploymentVerticle.lambda$setupTcpHttpServer$1(VertxHttpRecorder.java:1077)
        at io.vertx.core.impl.future.FutureImpl$3.onFailure(FutureImpl.java:153)
        at io.vertx.core.impl.future.FutureBase.emitFailure(FutureBase.java:75)
        at io.vertx.core.impl.future.FutureImpl.tryFail(FutureImpl.java:230)
        at io.vertx.core.impl.future.FixedMapping.onFailure(FixedMapping.java:36)
        at io.vertx.core.impl.future.FutureBase.lambda$emitFailure$1(FutureBase.java:69)
        at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:164)
        at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:469)
        at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:503)
        at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:986)
        at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
        at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
        at java.base/java.lang.Thread.run(Thread.java:829)

2022-04-29 00:33:16,669 ERROR [io.quarkus.vertx.core.runtime.VertxCoreRecorder] (vert.x-eventloop-thread-11) Uncaught exception received by Vert.x: java.lang.IllegalStateException: Result is already complete
        at io.vertx.core.Promise.fail(Promise.java:90)
        at io.quarkus.vertx.http.runtime.VertxHttpRecorder$WebDeploymentVerticle.lambda$setupTcpHttpServer$1(VertxHttpRecorder.java:1077)
        at io.vertx.core.impl.future.FutureImpl$3.onFailure(FutureImpl.java:153)
        at io.vertx.core.impl.future.FutureBase.emitFailure(FutureBase.java:75)
        at io.vertx.core.impl.future.FutureImpl.tryFail(FutureImpl.java:230)
        at io.vertx.core.impl.future.FixedMapping.onFailure(FixedMapping.java:36)
        at io.vertx.core.impl.future.FutureBase.lambda$emitFailure$1(FutureBase.java:69)
        at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:164)
        at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:469)
        at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:503)
        at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:986)
        at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
        at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
        at java.base/java.lang.Thread.run(Thread.java:829)

2022-04-29 00:33:16,669 ERROR [io.quarkus.vertx.core.runtime.VertxCoreRecorder] (vert.x-eventloop-thread-14) Uncaught exception received by Vert.x: java.lang.IllegalStateException: Result is already complete
        at io.vertx.core.Promise.fail(Promise.java:90)
        at io.quarkus.vertx.http.runtime.VertxHttpRecorder$WebDeploymentVerticle.lambda$setupTcpHttpServer$1(VertxHttpRecorder.java:1077)
        at io.vertx.core.impl.future.FutureImpl$3.onFailure(FutureImpl.java:153)
        at io.vertx.core.impl.future.FutureBase.emitFailure(FutureBase.java:75)
        at io.vertx.core.impl.future.FutureImpl.tryFail(FutureImpl.java:230)
        at io.vertx.core.impl.future.FixedMapping.onFailure(FixedMapping.java:36)
        at io.vertx.core.impl.future.FutureBase.lambda$emitFailure$1(FutureBase.java:69)
        at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:164)
        at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:469)
        at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:503)
        at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:986)
        at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
        at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
        at java.base/java.lang.Thread.run(Thread.java:829)

2022-04-29 00:33:16,809 ERROR [org.keycloak.quarkus.runtime.cli.ExecutionExceptionHandler] (main) ERROR: Failed to start server in (development) mode
2022-04-29 00:33:16,810 ERROR [org.keycloak.quarkus.runtime.cli.ExecutionExceptionHandler] (main) ERROR: Unable to start HTTP server
2022-04-29 00:33:16,810 ERROR [org.keycloak.quarkus.runtime.cli.ExecutionExceptionHandler] (main) ERROR: java.net.SocketException: Protocol family unavailable
2022-04-29 00:33:16,810 ERROR [org.keycloak.quarkus.runtime.cli.ExecutionExceptionHandler] (main) ERROR: Protocol family unavailable
2022-04-29 00:33:16,810 ERROR [org.keycloak.quarkus.runtime.cli.ExecutionExceptionHandler] (main) For more details run the same command passing the '--verbose' option. Also you can use '--help' to see the details about the usage of the particular command.

Unfortunately I could not find any pointers in the documentation.

Thank you for any pointers!