diff --git a/core/src/main/java/hudson/PluginManager.java b/core/src/main/java/hudson/PluginManager.java
index caead938c1..c04b8a1e59 100644
--- a/core/src/main/java/hudson/PluginManager.java
+++ b/core/src/main/java/hudson/PluginManager.java
@@ -36,6 +36,7 @@ import hudson.model.UpdateCenter;
 import hudson.model.UpdateSite;
 import hudson.util.CyclicGraphDetector;
 import hudson.util.CyclicGraphDetector.CycleDetectedException;
+import hudson.util.PersistedList;
 import hudson.util.Service;
 import org.apache.commons.fileupload.FileItem;
 import org.apache.commons.fileupload.disk.DiskFileItemFactory;
@@ -494,6 +495,24 @@ public abstract class PluginManager extends AbstractModelObject {
         rsp.sendRedirect("../updateCenter/");
     }
 
+    /**
+     * Bare-minimum configuration mechanism to change the update center.
+     */
+    public HttpResponse doSiteConfigure(@QueryParameter String site) throws IOException {
+        Hudson hudson = Hudson.getInstance();
+        hudson.checkPermission(Hudson.ADMINISTER);
+        UpdateCenter uc = hudson.getUpdateCenter();
+        PersistedList<UpdateSite> sites = uc.getSites();
+        for (UpdateSite s : sites) {
+            if (s.getId().equals("default"))
+                sites.remove(s);
+        }
+        sites.add(new UpdateSite("default",site));
+        
+        return HttpResponses.redirectToContextRoot();
+    }
+
+
     public HttpResponse doProxyConfigure(
             @QueryParameter("proxy.server") String server,
             @QueryParameter("proxy.port") String port,
diff --git a/core/src/main/java/hudson/model/UpdateCenter.java b/core/src/main/java/hudson/model/UpdateCenter.java
index 9588790cb0..58c69d7cda 100644
--- a/core/src/main/java/hudson/model/UpdateCenter.java
+++ b/core/src/main/java/hudson/model/UpdateCenter.java
@@ -193,6 +193,13 @@ public class UpdateCenter extends AbstractModelObject implements Saveable {
         return sites;
     }
 
+    public UpdateSite getSite(String id) {
+        for (UpdateSite site : sites)
+            if (site.getId().equals(id))
+                return site;
+        return null;
+    }
+
     /**
      * Gets the string representing how long ago the data was obtained.
      * Will be the newest of all {@link UpdateSite}s.
diff --git a/core/src/main/resources/hudson/PluginManager/advanced.jelly b/core/src/main/resources/hudson/PluginManager/advanced.jelly
index d6a922bf78..3a3f23620b 100644
--- a/core/src/main/resources/hudson/PluginManager/advanced.jelly
+++ b/core/src/main/resources/hudson/PluginManager/advanced.jelly
@@ -69,6 +69,16 @@ THE SOFTWARE.
               <f:submit value="${%Upload}" />
             </f:block>
           </f:form>
+
+          <h1>${%Update Site}</h1>
+          <f:form method="post" action="siteConfigure">
+            <f:entry title="${%URL}" >
+              <f:textbox name="site" value="${app.updateCenter.getSite('default').url}" />
+            </f:entry>
+            <f:block>
+              <f:submit value="${%Submit}" />
+            </f:block>
+          </f:form>
         </td>
       </tr>
     </table>