Exception during Project/Category synchro with CQ Connector

Hi all,
We were unfortunatly not able to run the synchronisation process between the DefectTrackingInteropSchema and a Jazz project (based on the Eclipse way process).

At first, we had problems with credentials for the Synchornizer user: this led us to remove all the J2EE security from the WebSpere Application Server. We also stopped using the https connection.

The User synchronization works perfectly (even accessing a https Jazz server)

The Project synchronization always completes with the following error:

D:\Java\jazz\connectors\gateway>synctool.bat -Dcq.recordType=Project
Running SyncTool...
log4j:WARN No appenders could be found for logger (org.apache.commons.httpclient.params.DefaultHttpParams).
log4j:WARN Please initialize the log4j system properly.
Trying to log in to http://TeamConcertConnector:password@sael0109.sae/jazz ...
Successfully logged in.

Synching Projects...
java.lang.NullPointerException
at com.ibm.rational.connector.cq.synctools.SyncTool.synchronizeObject(SyncTool.java:339)
at com.ibm.rational.connector.cq.synctools.SyncTool.synchronizeBySyncRule(SyncTool.java:261)
at com.ibm.rational.connector.cq.synctools.SyncTool.beginSync(SyncTool.java:231)
at com.ibm.rational.connector.cq.synctools.SyncTool.start(SyncTool.java:75)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:169)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:106)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:76)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:363)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:176)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:615)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:508)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:447)
at org.eclipse.equinox.launcher.Main.run(Main.java:1173)
at org.eclipse.equinox.launcher.Main.main(Main.java:1148)

We did enable the verbose at the Jazz server level to try to understand what is the problem by adding the following lines to our log4j.properties file:

log4j.logger.com.ibm.team.interop=DEBUG
log4j.logger.com.ibm.team.interop.service.outgoingSyncJob=DEBUG
log4j.logger.com.ibm.team.interop.service.incomingSyncJob=DEBUG

And here's what we found:

0000003c SystemOut O 16:31:59,901 DEBUG com.ibm.team.interop - ExternalProxy : Attempting incoming sync
0000003c SystemOut O 16:32:00,031 DEBUG com.ibm.team.interop - ExternalProxy : Completed incoming sync; updating proxy state
0000003c SystemOut O 16:32:00,053 ERROR com.ibm.team.interop - Exception during sync processing
com.ibm.team.repository.common.TeamRepositoryException: External URI and target item are linked to different proxies
at com.ibm.team.interop.service.internal.InteropService.doSaveProxy(InteropService.java:2113)
at com.ibm.team.interop.service.internal.InteropService.processIncoming(InteropService.java:1495)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:615)
at org.eclipse.soda.sat.core.internal.record.ExportProxyServiceRecord.invoke(ExportProxyServiceRecord.java:324)
at org.eclipse.soda.sat.core.internal.record.ExportProxyServiceRecord.access$0(ExportProxyServiceRecord.java:316)
at org.eclipse.soda.sat.core.internal.record.ExportProxyServiceRecord$1.invoke(ExportProxyServiceRecord.java:106)
at $Proxy118.processIncoming(Unknown Source)
at com.ibm.team.interop.service.internal.ProxySyncTask.processRequestQueue(ProxySyncTask.java:306)
at com.ibm.team.interop.service.internal.ProxySyncTask.transactionSucceeded(ProxySyncTask.java:201)
at com.ibm.team.repository.service.internal.AsynchronousTaskSchedulerService$2.transactionSucceeded(AsynchronousTaskSchedulerService.java:442)
at com.ibm.team.repository.service.internal.AsynchronousTaskSchedulerService$2.executeTask(AsynchronousTaskSchedulerService.java:450)
at com.ibm.team.repository.service.internal.scheduler.InstrumentedAsynchronousTask.executeTask(InstrumentedAsynchronousTask.java:63)
at com.ibm.team.repository.service.internal.scheduler.AsynchronousTaskRunner.run(AsynchronousTaskRunner.java:147)
at java.lang.Thread.run(Thread.java:799)

I think that this error is related with the fact that we did change the Jazz Server host information in the cqconnector.properties file from https to http.

It seems that it still records the old entry and complains about it.
Is there a way to reset the status of the synchronized objects without actually deleting them?

Thanks!