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                [TOC] # 防火墻 ****** 當你開啟一個 tcp 服務,卻發現訪問不了,那么你的考慮下是否是防火墻攔截了,目前,最常見的攔截有以下幾種情況: * 服務器本機防火墻攔截 * 服務器供應商攔截(阿里云,騰訊云安全組) 服務器本機攔截,可通過防火墻管理軟件,開端口,或者直接關閉防火墻進行解決(不建議):例如 centos 7 下,防火墻管理軟件為 firewalld。基礎命令為: ```shell systemctl start firewalld # 啟動 systemctl stop firewalld # 停止 systemctl status firewalld # 查看狀態 systemctl disable firewalld # 開機禁用 systemctl enable firewalld # 開機啟動 firewall-cmd --zone=public --add-port=80/tcp --permanent # 開放 80/tcp 端口 (---permanent 永久生效,沒有此參數重啟后生效) firewall-cmd --reload # firewall-cmd --zone=public --query-port=80/tcp # 查看 80/tcp 端口 firewall-cmd --zone=public --remove-port=80/tcp --permanent # 刪除該端口開放 ```
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