1.檢查80端口是否被占用了，輸入命令netstat -ltunp
2.如果被占用，kill掉這個進程
3.如果還是報上面錯誤，查看nginx site-enable的默認default文件中是否有listen [::]:80 default_server;有的話把他注釋掉，因為這行對應的是ipv6配置，同樣也可以在服務器開啟ipv6，應該就沒問題了
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