As I found out after quite some investigating and speculating, I ran into the NAS’s “auto block” capability. I had no idea I had logged into it a couple of times unsuccessfully, but that must have been it. As I was able to redisplay, I had tried to log in a couple of times and always interrupted that, and apparently that got counted as “unsuccessful log in attempts”, which led to “blocking for ever”. After cleaning that NAS’s block list, everything was fine again.
Then I looked into my main NAS’s block list, and right now there are 1280 IP addresses on it. I would love to export that list and sort it a little and do a few reverse look-ups, in order to relate them to “countries of origin” of these attacks. But the DSM does not support exporting the block list. May I suggest doing that? I will create a separate article resp. tweet with a proper title, suggesting to support the export of the block list.
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