[MarkLogic Dev General] XQSync : Authorization failed for admin user

[Lanz]

I've been using XQSync to backup some databases from one ML server
(version 4.1.3, W2003 R2 32 bits) to restore them on another ML server
 (version 4.1.3, W2008 64 bits R2).
Backup worked fine, I obtained a bunch of zip files. But for the
restore it doesn't work at all : XQSync throw me this error :

GRAVE: fatal error
com.marklogic.xcc.exceptions.RequestPermissionException: Authorization
failed for user 'admin'.
 [Session: user=admin, cb=kappaV3 [ContentSource: user=admin,
cb=kappaV3 [provider: address=localhost/127.0.0.1:9031, pool=0/64]]]
       at com.marklogic.xcc.impl.handlers.UnauthorizedHandler.handleResponse(UnauthorizedHandler.java:29)
       at com.marklogic.xcc.impl.handlers.EvalRequestController.serverDialog(EvalRequestController.java:68)
       at com.marklogic.xcc.impl.handlers.AbstractRequestController.runRequest(AbstractRequestController.java:72)
       at com.marklogic.xcc.impl.SessionImpl.submitRequest(SessionImpl.java:280)
       at com.marklogic.xcc.impl.CBMetaDataImpl.refreshServerVersion(CBMetaDataImpl.java:168)
       at com.marklogic.xcc.impl.CBMetaDataImpl.getServerVersionString(CBMetaDataImpl.java:128)
       at com.marklogic.ps.xqsync.XQSyncManager.run(XQSyncManager.java:169)
       at com.marklogic.ps.xqsync.XQSync.main(XQSync.java:81)


Command line : java -cp "xqsync.jar;xcc.jar;xstream.jar;xpp3.jar"
-Xms1024m -Xmx1024m -Dfile.encoding=UTF-8
-DOUTPUT_CONNECTION_STRING=xcc://admin:xxxx@localhost:9031/kappaV3
-DINPUT_PACKAGE=KappaV3-database-000.zip
com.marklogic.ps.xqsync.XQSync

I'm using 'admin' user which has 'admin' role and should have access
to target database. XDBC server on target database is created and
listen to right port...
I don't understand why it did not work...
Any help would be really appreciated.
Thanks

Lancelot