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Update nc.md
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command/nc.md

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@@ -60,7 +60,7 @@ TCP端口扫描
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y //用户输入
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```
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查看 443 端口是否被阻止
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查看从服务器到目的地的出站端口 443 是否被防火墙阻止
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```bash
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nc -vz acme-v02.api.letsencrypt.org 443 -w2

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