Error downloading plugin package if vCenter and plugin server are installed in a same windows OS with IPv6

Hi,

I setup a vCenter 6.0 on Windows Server 2012 R2. The Internet protocol is set as IPv6 (IPv4 is disabled). This windows joined a domain. And our plugin server is also on this windows OS. After register our plugin to this vCenter, restart vSphere web client service, we cannot see our plugin in Web Client. And got an error in the log:

Error downloading https://<FQDN>:<plugin_server_port>/PluginUI.zip. Make sure that the URL is reachable then logout/login to force another download. java.net.ConnectException: Connection refused: connect

    at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method)

    at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:85)

    at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:344)

    at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200)

    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182)

    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)

    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)

    at java.net.Socket.connect(Socket.java:579)

    at sun.security.ssl.SSLSocketImpl.connect(SSLSocketImpl.java:637)

    at sun.net.NetworkClient.doConnect(NetworkClient.java:175)

    at sun.net.www.http.HttpClient.openServer(HttpClient.java:432)

    at sun.net.www.http.HttpClient.openServer(HttpClient.java:527)

    at sun.net.www.protocol.https.HttpsClient.<init>(HttpsClient.java:264)

    at sun.net.www.protocol.https.HttpsClient.New(HttpsClient.java:367)

    at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.getNewHttpClient(AbstractDelegateHttpsURLConnection.java:191)

    at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:934)

    at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:177)

    at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1302)

    at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:468)

    at sun.net.www.protocol.https.HttpsURLConnectionImpl.getResponseCode(HttpsURLConnectionImpl.java:338)

    at com.vmware.vise.util.http.ConnectionManager.connect(ConnectionManager.java:233)

    at com.vmware.vise.util.http.SimpleHttpClient.connect(SimpleHttpClient.java:218)

    at com.vmware.vise.util.http.SimpleHttpClient.executeMethodResponseAsStream(SimpleHttpClient.java:109)

    at com.vmware.vise.vim.extension.VcExtensionManager.writePackageToFile(VcExtensionManager.java:905)

    at com.vmware.vise.vim.extension.VcExtensionManager.downloadPackage(VcExtensionManager.java:852)

    at com.vmware.vise.vim.extension.VcExtensionManager$1.call(VcExtensionManager.java:671)

    at com.vmware.vise.vim.extension.VcExtensionManager$1.call(VcExtensionManager.java:663)

    at java.util.concurrent.FutureTask.run(FutureTask.java:262)

    at com.vmware.vise.util.concurrent.QueuingCachedThreadPool$QueueProcessor.run(QueuingCachedThreadPool.java:866)

    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)

    at java.util.concurrent.FutureTask.run(FutureTask.java:262)

    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)

    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)

    at java.lang.Thread.run(Thread.java:745)

And here are the results I’ve tried:

- Win2k12R2 A

- vCenter 6.0 A installed on Win2k12R2 A

- Plugin A installed on Win2k12R2 A

- Win2k12R2 B

- vCenter 6.0 B installed on Win2k12R2 B

Cases:

(1) Plugin A register to vCenter A

(2) Plugin A register to vCenter B

- [Success] Case #1 and #2 with IPv4

- [Success] Case #2 with IPv6

- [Fail] Case #1 with IPv6, got error log above

Does anybody have idea about this issue?