ttestSetPortPriority junit test failing in tinderbox runs with junit.framework.AssertionFailedError: Port 1537 exceeeds expected maximum.

The following error has happened in the last 2 tinderbox runs on 10.6 branch:
http://dbtg.foundry.sun.com/derby/test/tinderbox_10.6_16/jvm1.6/testing/testlog/SunOS-5.10_i86pc-i386/963882-org.apache.derbyTesting.functionTests.suites.All_diff.txt
http://dbtg.foundry.sun.com/derby/test/tinderbox_10.6_16/jvm1.6/testing/testlog/SunOS-5.10_i86pc-i386/965354-org.apache.derbyTesting.functionTests.suites.All_diff.txt
There was 1 failure:
1) ttestSetPortPriority(org.apache.derbyTesting.functionTests.tests.derbynet.ServerPropertiesTest)junit.framework.AssertionFailedError: Port 1537 exceeeds expected maximum. You may need to update TestConfiguration.MAX_PORTS_USED and the Wiki page at http://wiki.apache.org/db-derby/DerbyJUnitTesting if test runs now require more available ports
at org.apache.derbyTesting.junit.TestConfiguration.getNextAvailablePort(TestConfiguration.java:1416)
at org.apache.derbyTesting.functionTests.tests.derbynet.ServerPropertiesTest.ttestSetPortPriority(ServerPropertiesTest.java:445)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at org.apache.derbyTesting.junit.BaseTestCase.runBare(BaseTestCase.java:109)
at junit.extensions.TestDecorator.basicRun(TestDecorator.java:24)
at junit.extensions.TestSetup$1.protect(TestSetup.java:21)
at junit.extensions.TestSetup.run(TestSetup.java:25)
at org.apache.derbyTesting.junit.BaseTestSetup.run(BaseTestSetup.java:57)
at junit.extensions.TestDecorator.basicRun(TestDecorator.java:24)
at junit.extensions.TestSetup$1.protect(TestSetup.java:21)
at junit.extensions.TestSetup.run(TestSetup.java:25)
at junit.extensions.TestDecorator.basicRun(TestDecorator.java:24)
at junit.extensions.TestSetup$1.protect(TestSetup.java:21)
at junit.extensions.TestSetup.run(TestSetup.java:25)
at junit.extensions.TestDecorator.basicRun(TestDecorator.java:24)
at junit.extensions.TestSetup$1.protect(TestSetup.java:21)
at junit.extensions.TestSetup.run(TestSetup.java:25)