We have blocked access from some ISP in Japan.
Because, as a measure against DDoS attack.

@TheAdmin Can you share the list so other instances can use it? I'd like to check our logs for ddos events.

@freemo @TheAdmin Yes, please share the IPs, so other mastodon admins can have a look in their logs.

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@seb @freemo
The attack source is access from AS Number 2516 (KDDI).
IP addresses change frequently ( but, All are IPv6 addresses).
Maybe, It is an attack that individually targets mastodon.cloud because it contains posts by personal grudge.

A completely different DDoS attack from Russia and Ukraine has become active. These have been confirmed to cause damage to other servers and require attention.

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mastodon.cloud

Recently, the handling of online defamation has become a hot topic on many mass media as well as social media channels. News Article for Reference: https://www.jiji.com/sp/article?k=2020052500387 In response to these reports, it is expected that lawsuits and disclosure requests will become more publicly known; and government agencies will order stricter enforcement in addition to tightening regulations. However, under the current state of Japan, we will not be able to handle the increase of such administrative burdens and will have trouble dealing with it appropriately. Thus, we have decided to stop providing our service on mstdn.jp and mastodon.cloud starting June 30, 2020. We are very sorry for the inconvenience and appreciate your understanding on the matter.