Can't connect to RSC using telnet

RSC supports a maximum of two simultaneous telnet connections. This includes command line interface sessions and RSC GUI connections to the server console (Open Console). When two telnet sessions are active, further attempts to connect using the telnet command will receive a connection closed error. For example, from UNIX:

% telnet bert-rsc
Trying 129.148.49.120...
Connected to bert-rsc.
Escape character is '^]'.
Connection closed by foreign host.