When install Zerotier at first, it runs well. After days running on Synology, zerotier goes offline, and don’t know how to back online again.
I had the same problem.
My Synology is 918+.DSM6.2.3.
CPU is j3455
I install [zerotier_apollolake-6.1_1.4.0-0.spk].
The GUI show offline all the time.It never works…sigh~