Enterprise Administration > Implementing Windchill ESI > Implementing Windchill ESI in an SAP Environment > Technology Considerations for Traversing WANs and Firewalls > Traversing WANs and Firewalls with TIBCO Rendezvous > Rendezvous Secured Daemons (RVSD) and Rendezvous Routing Secured Daemons (RVRSD)
  
Rendezvous Secured Daemons (RVSD) and Rendezvous Routing Secured Daemons (RVRSD)
The two ordinary Rendezvous daemons, RVD and RVRD, communicate with clients over non-secure TCP connections. In contrast, their secure counterparts, RVSD and RVSRD, communicate with clients over SSL connections, allowing secure client communication over non-secure networks. Secure daemons restrict client access in three ways:
Only authorized clients can connect to a secure daemon.
Secure daemons restrict the combinations of network and UDP or PGM service over which client transports can communicate.
Secure daemons limit the subject space that its clients can access.
Although they ensure secure client connections, both secure daemons transmit messages as plain text. That is, when they publish messages from clients to local networks, the messages are not encrypted.
See Secure Daemons (RVSD and RVSRD), in the TIBCO Rendezvous Administration manual for a complete explanation.