java.net.SocketException: Connection reset with ibm 1.5. running ServerPropertiesTest in suites.All

When running suites.All with ibm 1.5 on AIX I've twice (both with 10.5.1.0 (RC1) and 10.5.1.1 RC2) seen a stack trace with a java.net.socketException: Connection reset.
I believe this left a socket on the machine in a bad state and caused hangs when running suites.All with either ibm15, or ibm16 jvms until I booted the machine.

There is no test failure corresponding to this.

This is the stack trace:

java.net.SocketException: Connection reset
at java.net.SocketInputStream.read(SocketInputStream.java:197)
at java.net.SocketInputStream.read(SocketInputStream.java:116)
at org.apache.derby.impl.drda.NetworkServerControlImpl.fillReplyBuffer(Unknown Source)
at org.apache.derby.impl.drda.NetworkServerControlImpl.readResult(Unknown Source)
at org.apache.derby.impl.drda.NetworkServerControlImpl.pingWithNoOpen(Unknown Source)
at org.apache.derby.impl.drda.NetworkServerControlImpl.ping(Unknown Source)
at org.apache.derby.drda.NetworkServerControl.ping(Unknown Source)
at org.apache.derbyTesting.junit.NetworkServerTestSetup.pingForServerUp(NetworkServerTestSetup.java:561)
at org.apache.derbyTesting.functionTests.tests.derbynet.ServerPropertiesTest.canPingServer(ServerPropertiesTest.java:302)
at org.apache.derbyTesting.functionTests.tests.derbynet.ServerPropertiesTest.ttestSetPortPriority(ServerPropertiesTest.java:491)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:79)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:618)
at junit.framework.TestCase.runTest(TestCase.java:154)
at junit.framework.TestCase.runBare(TestCase.java:127)
at org.apache.derbyTesting.junit.BaseTestCase.runBare(BaseTestCase.java:105)
at junit.framework.TestResult$1.protect(TestResult.java:106)
at junit.framework.TestResult.runProtected(TestResult.java:124)
at junit.framework.TestResult.run(TestResult.java:109)
at junit.framework.TestCase.run(TestCase.java:118)
at junit.extensions.TestDecorator.basicRun(TestDecorator.java:22)
at junit.extensions.TestSetup$1.protect(TestSetup.java:19)
at junit.framework.TestResult.runProtected(TestResult.java:124)
at junit.extensions.TestSetup.run(TestSetup.java:23)
at org.apache.derbyTesting.junit.BaseTestSetup.run(BaseTestSetup.java:57)
at junit.extensions.TestDecorator.basicRun(TestDecorator.java:22)
at junit.extensions.TestSetup$1.protect(TestSetup.java:19)
at junit.framework.TestResult.runProtected(TestResult.java:124)
at junit.extensions.TestSetup.run(TestSetup.java:23)
at junit.extensions.TestDecorator.basicRun(TestDecorator.java:22)
at junit.extensions.TestSetup$1.protect(TestSetup.java:19)
at junit.framework.TestResult.runProtected(TestResult.java:124)
at junit.extensions.TestSetup.run(TestSetup.java:23)
at junit.extensions.TestDecorator.basicRun(TestDecorator.java:22)
at junit.extensions.TestSetup$1.protect(TestSetup.java:19)
at junit.framework.TestResult.runProtected(TestResult.java:124)
at junit.extensions.TestSetup.run(TestSetup.java:23)
at junit.framework.TestSuite.runTest(TestSuite.java:208)
at junit.framework.TestSuite.run(TestSuite.java:203)
at junit.framework.TestSuite.runTest(TestSuite.java:208)
at junit.framework.TestSuite.run(TestSuite.java:203)
at junit.framework.TestSuite.runTest(TestSuite.java:208)
at junit.framework.TestSuite.run(TestSuite.java:203)
at junit.framework.TestSuite.runTest(TestSuite.java:208)
at junit.framework.TestSuite.run(TestSuite.java:203)
at junit.textui.TestRunner.doRun(TestRunner.java:116)
at junit.textui.TestRunner.start(TestRunner.java:172)
at junit.textui.TestRunner.main(TestRunner.java:138)
java.net.SocketException: Connection reset
at java.net.SocketInputStream.read(SocketInputStream.java:197)
at java.net.SocketInputStream.read(SocketInputStream.java:116)
at org.apache.derby.impl.drda.NetworkServerControlImpl.fillReplyBuffer(Unknown Source)
at org.apache.derby.impl.drda.NetworkServerControlImpl.readResult(Unknown Source)
at org.apache.derby.impl.drda.NetworkServerControlImpl.pingWithNoOpen(Unknown Source)
at org.apache.derby.impl.drda.NetworkServerControlImpl.ping(Unknown Source)
at org.apache.derby.drda.NetworkServerControl.ping(Unknown Source)
at org.apache.derbyTesting.junit.NetworkServerTestSetup.pingForServerUp(NetworkServerTestSetup.java:561)
at org.apache.derbyTesting.functionTests.tests.derbynet.ServerPropertiesTest.canPingServer(ServerPropertiesTest.java:302)
at org.apache.derbyTesting.functionTests.tests.derbynet.ServerPropertiesTest.ttestSetPortPriority(ServerPropertiesTest.java:491)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:79)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:618)
at junit.framework.TestCase.runTest(TestCase.java:154)
at junit.framework.TestCase.runBare(TestCase.java:127)
at org.apache.derbyTesting.junit.BaseTestCase.runBare(BaseTestCase.java:105)
at junit.framework.TestResult$1.protect(TestResult.java:106)
at junit.framework.TestResult.runProtected(TestResult.java:124)
at junit.framework.TestResult.run(TestResult.java:109)
at junit.framework.TestCase.run(TestCase.java:118)
at junit.extensions.TestDecorator.basicRun(TestDecorator.java:22)
at junit.extensions.TestSetup$1.protect(TestSetup.java:19)
at junit.framework.TestResult.runProtected(TestResult.java:124)
at junit.extensions.TestSetup.run(TestSetup.java:23)
at org.apache.derbyTesting.junit.BaseTestSetup.run(BaseTestSetup.java:57)
at junit.extensions.TestDecorator.basicRun(TestDecorator.java:22)
at junit.extensions.TestSetup$1.protect(TestSetup.java:19)
at junit.framework.TestResult.runProtected(TestResult.java:124)
at junit.extensions.TestSetup.run(TestSetup.java:23)
at junit.extensions.TestDecorator.basicRun(TestDecorator.java:22)
at junit.extensions.TestSetup$1.protect(TestSetup.java:19)
at junit.framework.TestResult.runProtected(TestResult.java:124)
at junit.extensions.TestSetup.run(TestSetup.java:23)
at junit.extensions.TestDecorator.basicRun(TestDecorator.java:22)
at junit.extensions.TestSetup$1.protect(TestSetup.java:19)
at junit.framework.TestResult.runProtected(TestResult.java:124)
at junit.extensions.TestSetup.run(TestSetup.java:23)
at junit.framework.TestSuite.runTest(TestSuite.java:208)
at junit.framework.TestSuite.run(TestSuite.java:203)
at junit.framework.TestSuite.runTest(TestSuite.java:208)
at junit.framework.TestSuite.run(TestSuite.java:203)
at junit.framework.TestSuite.runTest(TestSuite.java:208)
at junit.framework.TestSuite.run(TestSuite.java:203)
at junit.framework.TestSuite.runTest(TestSuite.java:208)
at junit.framework.TestSuite.run(TestSuite.java:203)
at junit.textui.TestRunner.doRun(TestRunner.java:116)
at junit.textui.TestRunner.start(TestRunner.java:172)
at junit.textui.TestRunner.main(TestRunner.java:138)