I'm very sorry to say that but finally. My ISP confirmed their fault.
Thank you everyone who tried to help!
already spent most of my weekend, but still wasn't able to solve this ;(please first read the recommendations given to others who have that problem...Hi,
I'm another one who is struggling to make NTP (both server and client) works on my CRS326-24G-2S+ device.
Sorry, something went wrong during copy-paste. fixed.moquotede ??????moquotede: broadcast