serviceability/dcmd/framework/VMVersionTest.java fails with connection refused error.

Running DCMD 'VM.version' through 'JMXExecutor'
---------------- stdout ----------------
Java HotSpot(TM) 64-Bit Server VM version 15-ea+6-109
JDK 15.0.0

---------------- stderr ----------------

----------------------------------------

test VMVersionTest.jmx(): success
debugee.stdout> Test Java process started!
debugee.stderr> Exception in thread "main" nsk.share.Failure: Unable to attach for IOPipe connection to localhost:49196 for 120000ms timeout:
debugee.stderr> java.net.ConnectException: Connection refused
debugee.stderr> at nsk.share.jpda.BasicSocketConnection.continueAttach(SocketConnection.java:281)
debugee.stderr> at nsk.share.jpda.SocketConnection.continueAttach(SocketConnection.java:485)
debugee.stderr> at nsk.share.jpda.SocketIOPipe.connect(SocketIOPipe.java:240)
debugee.stderr> at nsk.share.jpda.IOPipe.connect(IOPipe.java:88)
debugee.stderr> at nsk.share.jpda.SocketIOPipe.println(SocketIOPipe.java:181)
debugee.stderr> at process.TestJavaProcess.main(TestJavaProcess.java:47)
test VMVersionTest.mainClass(): failure
nsk.share.Failure: Unable to send object throw not established IOPipe connection:
quit
at nsk.share.jpda.SocketConnection.writeObject(SocketConnection.java:564)
at nsk.share.jpda.SocketIOPipe.println(SocketIOPipe.java:183)
at TestProcessLauncher.quit(TestProcessLauncher.java:80)
at VMVersionTest.mainClass(VMVersionTest.java:68)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:85)
at org.testng.internal.Invoker.invokeMethod(Invoker.java:639)
at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:821)
at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1131)
at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:124)
at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:108)
at org.testng.TestRunner.privateRun(TestRunner.java:773)
at org.testng.TestRunner.run(TestRunner.java:623)
at org.testng.SuiteRunner.runTest(SuiteRunner.java:357)
at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:352)
at org.testng.SuiteRunner.privateRun(SuiteRunner.java:310)
at org.testng.SuiteRunner.run(SuiteRunner.java:259)
at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)
at org.testng.TestNG.runSuitesSequentially(TestNG.java:1185)
at org.testng.TestNG.runSuitesLocally(TestNG.java:1110)
at org.testng.TestNG.run(TestNG.java:1018)
at com.sun.javatest.regtest.agent.TestNGRunner.main(TestNGRunner.java:94)
at com.sun.javatest.regtest.agent.TestNGRunner.main(TestNGRunner.java:54)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:127)
at java.base/java.lang.Thread.run(Thread.java:832)
debugee.stdout> Test Java process started!
debugee.stdout> Waiting for the quit command from the test ...