1. Start user trace session
fbtracemgr -se
inet://service_mgr -start -conf fbtrace.conf -user sysdba -pass masterkey
2. Show list of active trace sessions
fbtracemgr -se
inet://service_mgr -list -user sysdba -pass masterkey
Session ID: 1
user:
date: 2019-01-28 14:06:51
flags: active, trace
The "user" field is empty