Running updater from command line

I am trying to setup a 'mirror site' for downloading updates for WDSCi, 
following the instructions of Mark Phippard (see thread 
http://archive.midrange.com/wdsci-l/200602/msg00378.html for details). 

I have added some command line parameters to the java command, because I 
am behind a firewall. One of the commands now looks like this:

java -cp startup.jar org.eclipse.core.launcher.Main -Dhttp.proxySet=true 
-Dhttp.proxyHost=proxy.lb.abbott.corp -Dhttp.proxyPort=80 -application 
org.eclipse.update.core.standaloneUpdate -command mirror -from 
http://www3.software.ibm.com/ibmdl/pub/software/rationalsdp/updater/60/update 
-to %drive%\%local% -mirrorURL %url%/site.xml

I am sure that the proxyHost and proxyPort settings are correct. When I 
use these values in Rational Product Updater, the search process completes 
normally. When I make a change to the values, the process terminates with 
an error. 

Nevertheless, when I run the above command, I get an error. In the command 
window itself, the following message is displayed:

PolicyClassLoader could not find policy 
com.ibm.jxesupport.JxeClassLoaderpolicy
Analyzing features already mirrored ... Done.
Command failed. Please check log file [...] for details.

The first message in the command window seems troubling, but the second 
message seems to be more promising. But, the last message again indicates 
trouble. The contents of the log file is as follows:

!SESSION Nov 01, 2006 11:58:06.652 
---------------------------------------------
eclipse.buildId=I200406192000
java.version=1.5.0_06
java.vendor=Sun Microsystems Inc.
BootLoader constants: OS=win32, ARCH=x86, WS=win32, NL=en_US
Command-line arguments: -Dhttp.proxySet=true 
-Dhttp.proxyHost=proxy.lb.abbott.corp -Dhttp.proxyPort=80 -application 
org.eclipse.update.core.standaloneUpdate -command mirror -from 
http://www3.software.ibm.com/ibmdl/pub/software/rationalsdp/updater/60/update 
-to C:\\wdsc_site -mirrorURL http://webserver/wdsc6_updates/site.xml

!ENTRY org.eclipse.update.core 4 42 Nov 01, 2006 11:58:06.652
!MESSAGE Unable to access 
"http://www3.software.ibm.com/ibmdl/pub/software/rationalsdp/updater/60/update";.
!SUBENTRY 1 org.eclipse.update.core 4 42 Nov 01, 2006 11:58:06.652
!MESSAGE Unable to access site: 
"http://www3.software.ibm.com/ibmdl/pub/software/rationalsdp/updater/60/update"; 
[www3.software.ibm.com]
!STACK 0
java.net.UnknownHostException: www3.software.ibm.com
        at java.net.PlainSocketImpl.connect(Unknown Source)
        at java.net.Socket.connect(Unknown Source)
        at sun.net.NetworkClient.doConnect(Unknown Source)
        at sun.net.www.http.HttpClient.openServer(Unknown Source)
        at sun.net.www.http.HttpClient.openServer(Unknown Source)
        at sun.net.www.http.HttpClient.<init>(Unknown Source)
        at sun.net.www.http.HttpClient.New(Unknown Source)
        at sun.net.www.http.HttpClient.New(Unknown Source)
        at 
sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(Unknown 
Source)
        at 
sun.net.www.protocol.http.HttpURLConnection.plainConnect(Unknown Source)
        at sun.net.www.protocol.http.HttpURLConnection.connect(Unknown 
Source)
        at 
sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
        at 
org.eclipse.update.internal.core.ConnectionThreadManager$StreamRunnable.run(ConnectionThreadManager.java:75)
        at java.lang.Thread.run(Unknown Source)
!SUBENTRY 1 org.eclipse.update.core 4 42 Nov 01, 2006 11:58:06.652
!MESSAGE Unable to access site: 
"http://www3.software.ibm.com/ibmdl/pub/software/rationalsdp/updater/60/update/site.xml";
 
[www3.software.ibm.com]
!STACK 0
java.net.UnknownHostException: www3.software.ibm.com
        at java.net.PlainSocketImpl.connect(Unknown Source)
        at java.net.Socket.connect(Unknown Source)
        at sun.net.NetworkClient.doConnect(Unknown Source)
        at sun.net.www.http.HttpClient.openServer(Unknown Source)
        at sun.net.www.http.HttpClient.openServer(Unknown Source)
        at sun.net.www.http.HttpClient.<init>(Unknown Source)
        at sun.net.www.http.HttpClient.New(Unknown Source)
        at sun.net.www.http.HttpClient.New(Unknown Source)
        at 
sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(Unknown 
Source)
        at 
sun.net.www.protocol.http.HttpURLConnection.plainConnect(Unknown Source)
        at sun.net.www.protocol.http.HttpURLConnection.connect(Unknown 
Source)
        at 
sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
        at 
org.eclipse.update.internal.core.ConnectionThreadManager$StreamRunnable.run(ConnectionThreadManager.java:75)
        at java.lang.Thread.run(Unknown Source)

(I have also tried a version with -Dhttp.proxyEnabled=true instead of 
-Dhttp.proxySet=true.)

I don't know what's causing the error, given that the proxy-settings seem 
to be okay. Does anyone have a clue?

Thanks in advance,

Ewout