Welcome to the community !
What type of service and modem/router do you have? If you're having problem accessing some website. 1. You can manually set google's DNS just to check if you're able to access the Chinese Website you'd like to open. 2. You can perform a factory reset ( pushing the rest button behind/back of the modem )
Note: If you Factory Reset your modem you need to re-configure the modem/router's connection settings and Wireless network and password.
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