User no longer logged on - maint_service

I've installed a NW 7.4 SP08 ABAP Stack that includes all of the Gateway 2.0 Foundation.  This is my Netweaver Gateway Hub.

Our backend ECC 6.0 system is at SP24 but we've never applied any Enhancement Packs.  So we've imported the IW_BEP 2.0 Add-on and patched it to SP10.

1. The RFC's are defined.
2. The Trust has been created.
3. The *_sso2_ticket parameters are in place.
4. The Destination System and the System Alias (two of them) are defined.

Is there a simple way to test this is setup and working as it should be?

When I try to run /iwfnd/maint_service in the Gateway Hub to setup a service to test the connection, I get the following pop-up.

SAP System Message

User no longer logged on

I've yet to get this transaction to work.  Any suggestions?