I wonder if you have received iOS 10 updates on your iPhones? In addition to the previous functional changes, many netizens in the official version found that Apple had finally poisoned the PPTP protocol in the VPN (virtual private network), leaving only IKEv2, L2TP and IPSec. Although the author prefers IPSec in actual use, after all, it is more stable, and PPTP often fails to connect, which makes it feel like a chicken's ribs. But it is better to have more options. After all, your environment is still in the network.
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