We installed TNCM 6.3.
Presentation server is installed in one server in secure zone and the worker server talking to devices is installed on anther server in DMZ zone.
When a UOW task initiated, it take about 20-30 minutes for the worker in the DMZ zone to pick up. Then as reminded by support, we noticed that there is a 20-min system time gap between the presentation server and the worker server. Then we found the NTP was not set up properly by the Linux system administrator. After the time gap fixed, it works fine. So the lesson is in a PoC env, don’t take some basic services such as NTP for granted. It’s always worthwhile to check the server’s basic configurations, such as NTP, DNS, etc.