Enterprise Replication between 9.40 and 10.00

Hi I'm trying to add in a new 10.00.FC4 (RHEL AS4) server into an Enterprise Replication environment that already has 2 servers running 9.40.FC2 (Tru64 5.1B), but when I issue the cdr define server command from the sync_server, I get the following error: connect to g_bsids2b failed This feature of Enterprise Replication is not yet supported. (101) I've looked at the documentation surrounding the CDRSITES_ environment variables, but can't find anything applicable, and all of the usual connectivity is working correctly for replication from a host equivalence perspective. I can also define replication successfully for the 10.00 server on its own. Any suggestions?