Internet & Connectivity · critical
VPN 在中国无法使用怎么办？
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⚠️ SYMPTOM
你已经抵达中国，打开 VPN 后根本无法连接，或者虽然显示已连接但所有流量都无法加载。
🔍 MOST LIKELY CAUSE
中国的 Great Firewall 会主动探测并封锁大多数商用 VPN 协议；免费 VPN 和无人维护的 OpenVPN 配置在抵达后几天内就会被封锁。
✓ HOW TO FIX
在进入中国之前安装两款带混淆功能的付费 VPN（如 Astrill StealthVPN、LetsVPN 或 NordVPN 混淆模式），当其中一个服务器不可用时立即切换到另一个。
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