--- a/test/jdk/java/net/ipv6tests/TcpTest.java	Thu May 09 17:49:28 2019 +0100
+++ b/test/jdk/java/net/ipv6tests/TcpTest.java	Fri May 17 13:21:44 2019 +0100
@@ -25,7 +25,9 @@
  * @test
  * @bug 4868820
  * @key intermittent
- * @summary IPv6 support for Windows XP and 2003 server
+ * @summary IPv6 support for Windows XP and 2003 server. This test requires
+ *          binding to the wildcard address, and as such is susceptible
+ *          of intermittent failures caused by port reuse policy.
  * @library /test/lib
  * @build jdk.test.lib.NetworkConfiguration
  *        jdk.test.lib.Platform
@@ -59,6 +61,10 @@
 
     public static void main (String[] args) throws Exception {
         checkDebug(args);
+        if (ia4addr == null) {
+            System.out.println ("No IPV4 addresses: exiting test");
+            return;
+        }
         if (ia6addr == null) {
             System.out.println ("No IPV6 addresses: exiting test");
             return;
@@ -217,4 +223,3 @@
         System.out.println ("Test4: OK");
     }
 }
-