Here I just upgraded my NAS from Ubuntu 22.04 to 24.04. I check the services running on the NAS. I found Transmission Daemon is not active.
I reboot the Ubuntu server. Transmission Web UI is live for a while, then lost the connection. I went to the SSH window. Check the status of the service.
After I checked Google, I found a workaround. It is not a solution, but works.
Edit /etc/systemd/system/transmission-daemon.service
Change the Type=simple
Then the file looks like below:
Reference:
transmission-daemon times out when launched by systemdtransmission-daemon fails to notify systemd of correct start