localhost: 3000 was distressed by ESET

tl; dr

--I started the Rails server for the first time, but I can't access localhost: 3000 first. --It seems that the personal firewall of ESET (security software) is doing something wrong. --I was able to access with instead of localhost: 3000

Referenced site

[Why can't I connect to a web application under development with [:: 1] on a mac with eset?] (https://ja.stackoverflow.com/questions/66740/eset-%E3%82%92%E5%85%A5%E3%82%8C%E3%81%9F-mac-%E3%81%A7-1-%E3%81%A7%E9%96%8B%E7%99%BA%E4%B8%AD%E3%82%A6%E3%82%A7%E3%83%96%E3%82%A2%E3%83%97%E3%83%AA%E3%82%B1%E3%83%BC%E3%82%B7%E3%83%A7%E3%83%B3%E3%81%AB%E6%8E%A5%E7%B6%9A%E3%81%A7%E3%81%8D%E3%81%AA%E3%81%84%E3%81%AE%E3%81%AF%E4%BD%95%E6%95%85)

I don't know about the internet

It seems that it cannot be accessed via IPv6 and can be accessed via IPv4. I'm not sure what the IP address is or why it was resolved, so I'd like to read a book.

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localhost: 3000 was distressed by ESET
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