OK, the server is responding and all instances are being brought back up.
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Masto.host (mastohost@mastodon.social)'s status on Tuesday, 28-Aug-2018 16:39:38 JST 
Masto.host
            - さっこ and フジイユウジ repeated this.
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Masto.host (mastohost@mastodon.social)'s status on Tuesday, 28-Aug-2018 16:48:28 JST 
Masto.host
               All Masto.host instances are up and running.
I will try and get a response from the data center to what went on with this server.
Really sorry about the trouble.
Any issues, let me know.
フジイユウジ and くろま????オカどん管理人 repeated this. - 
              
Masto.host (mastohost@mastodon.social)'s status on Tuesday, 28-Aug-2018 16:52:24 JST 
Masto.host
               Response from the data center: "problem with the network connector" of that server that required human intervention.
くろま????オカどん管理人 repeated this.