Technical data

means that the CTF object at the remote server is protected by a user name
and password. Either you have failed to supply the user name and password
with the START command, or you have specified them incorrectly.
The message:
%SYSTEM-F-REJECT, Connect to network object rejected
usually means that you have tried to trace a remote server that has been
configured as a Phase IV router; CTF is supported only on servers that
have been configured as DECnet/OSI for VMS routers. Use the NETTRACE
facility to trace remote Phase IV servers. See the Problem Solving Guide for
the product you are tracing for information on how to use NETTRACE.
3–14 Using CTF