Minor Description
I observed delays when trying to shutdown guacd cleanly:
2020-02-12 12:20:52.886 [some-app] [0c7bfb7f-c009-4685-8b83-a144aa0bb4f6] [140049387599616]: guacd[174]: DEBUG: Client terminated successfully. 2020-02-12 12:20:52.887 [some-app] [0c7bfb7f-c009-4685-8b83-a144aa0bb4f6] [140049387599616]: guacd[166]: ERROR: Error handling message from VNC server. 2020-02-12 12:20:52.887 [some-app] [0c7bfb7f-c009-4685-8b83-a144aa0bb4f6] [140049387599616]: guacd[166]: INFO: User "@e2dac0b0-5e01-4b3e-8898-14d2d351abee" disconnected (0 users remain) 2020-02-12 12:20:52.887 [some-app] [0c7bfb7f-c009-4685-8b83-a144aa0bb4f6] [140049387599616]: guacd[166]: INFO: Last user of connection "$902a4fea-c198-409f-a249-9a5dbaa4bdec" disconnected 2020-02-12 12:20:52.887 [some-app] [0c7bfb7f-c009-4685-8b83-a144aa0bb4f6] [140049387599616]: guacd[166]: DEBUG: Requesting termination of client... 2020-02-12 12:20:52.887 [some-app] [0c7bfb7f-c009-4685-8b83-a144aa0bb4f6] [140049387599616]: guacd[166]: INFO: Internal VNC client disconnected 2020-02-12 12:20:57.887 [some-app] [0c7bfb7f-c009-4685-8b83-a144aa0bb4f6] [140049387599616]: guacd[166]: WARNING: Client did not terminate in a timely manner. Forcibly terminating client and any child processes.
I suspect the client actually terminated properly (see log message "Internal VNC client disconnected").