Building Zimbra desktop error on windows

[hong]

I try it many times in windows 7 beta and windows 2003, but no luck.
The jdk is 1.5.0.17, the ant is 1.7,
I tried the zimbra 5.0.6 and 5.0.11, but the error is the same :

start-jetty-windows:

start-jetty-java:
     [echo]  jetty java to start:
     [echo]  java.library.path="d:\opt\zimbra\zdesktopdev\lib"
     [echo]  START="d:\opt\zimbra\zdesktopdev\jetty\etc\start.config"
     [echo]  zimbra.config="d:\opt\zimbra\zdesktopdev\conf\localconfig.xml"

start-jetty-unix:

start-jetty:
     [echo] Waiting for jetty to start

offline-reset-the-world-part-2:

offline-deploy-zimlets:

offline-install-zimlet:
     [echo] deploy d:\opt\zimbra\zdesktopdev\zimlets\com_zimbra_date.zip
     [java] [] ERROR: Error
     [java] com.zimbra.cs.zclient.ZClientException: invoke Connection refused:
onnect, server: localhost
     [java] ExceptionId:main:1231422819741:e8833d7d8fcd5319
     [java] Code:zclient.IO_ERROR
     [java]     at com.zimbra.cs.zclient.ZClientException.IO_ERROR(ZClientExce
ion.java:47)
     [java]     at com.zimbra.cs.account.soap.SoapProvisioning.invoke(SoapProv
ioning.java:195)
     [java]     at com.zimbra.cs.account.soap.SoapProvisioning.soapAdminAuthen
cate(SoapProvisioning.java:144)
     [java]     at com.zimbra.cs.zimlet.ZimletUtil$ZimletSoapUtil.initZimletSo
Util(ZimletUtil.java:1124)
     [java]     at com.zimbra.cs.zimlet.ZimletUtil$ZimletSoapUtil.<init>(Zimle
til.java:1108)

after build, i find the port 7633 is open. I also search in the forum and google, someone else have the similar issue on windows, but it seems there is no useful information to fix the issue.
Anybody could give some idea? Thanks