Using ProfileTokenCredential on V5R1?

Folks:

Does anyone have experience using ProfileTokenCredential on V5R1?

As I understand the concept, the ProfileTokenCredential should allow me
to get authenticated on a system using a connection ... pass the
credential object to another application (via RMI, say) that uses the
credential object to establish a separate connection and can operate as
the originally authenticated user.

What I need to be able to do is, assuming a user is authenticated to the
 AS400 in another JVM, pass some kind of authentication token to a
server via RMI so that the server can perform operations on the same
host under the users credentials.

My code is something like this ...

On the client:

After establishing a connection with a AS400 object, I do ...
ProfileTokenCredential pt = as400.getProfileToken();

I then pass the object pt to my other application via RMI.

On the server:

I establish a new AS400 object, with the passed in profile token object,
by doing ...
AS400 as400 = new AS400(systemName, profileToken);

I then proceed to try and invoke a command with ...

CommandCall cc = new CommandCall(as400);
cc.run("addlible devdmgwrk");

At which point I get the following exceptions ...

Fri Dec 08 12:23:02 CST 2006  Start server failed with return code:
00 01 00 0A
java.lang.Throwable
        at com.ibm.as400.access.Trace.log(Trace.java:1062)
        at com.ibm.as400.access.Trace.log(Trace.java:984)
        at
com.ibm.as400.access.AS400ImplRemote.getConnection(AS400ImplRemote.java:1059)
        at
com.ibm.as400.access.RemoteCommandImplRemote.open(RemoteCommandImplRemote.java:139)
        at
com.ibm.as400.access.RemoteCommandImplRemote.runCommand(RemoteCommandImplRemote.java:184)
        at com.ibm.as400.access.CommandCall.run(CommandCall.java:579)
        at com.ibm.as400.access.CommandCall.run(CommandCall.java:610)
        at <my code>

Fri Dec 08 12:23:02 CST 2006  Establishing connection failed:
com.ibm.as400.access.ServerStartupException: Error in request data.
        at
com.ibm.as400.access.AS400ImplRemote.returnSecurityException(AS400ImplRemote.java:1381)
        at
com.ibm.as400.access.AS400ImplRemote.getConnection(AS400ImplRemote.java:1060)
        at
com.ibm.as400.access.RemoteCommandImplRemote.open(RemoteCommandImplRemote.java:139)
        at
com.ibm.as400.access.RemoteCommandImplRemote.runCommand(RemoteCommandImplRemote.java:184)
        at com.ibm.as400.access.CommandCall.run(CommandCall.java:579)
        at com.ibm.as400.access.CommandCall.run(CommandCall.java:610)
        at <my code>

Any suggestions?

Is ProfileTokenCredential not going to do what I need?

Thanks!

david