I am again experiencing just how crappy Synology is. For several days now I am unable to login to the administrative interface. The NAS works and I can connect to the file shares — but access via web or SSH times out. It's like the services are stuck. I will need to do a soft reset this weekend and pray that the data is safe. This is the third major incident with Synology across two different NAS models in six years of ownership, which I deem completely unacceptable. Not to mention that Time Machine regularly breaks down. I'll be moving to a .S. Ubiquity NAS at the next possible opportunity.
P.S. Just as I wrote I tI managed to login. I guess this piece of *** got scared

. It's still rather unresponsive. Appears that a data scrubbing task is running, but that should not render the admin console inaccessible.
P.P.S. Canceling the data scrubbing fixed the responsiveness issue. I also found out that the data scrub has not been completed in over two years, although it's set up to automatically run every week.