Hi @chenshixiong
Greetings from McAfee.
Sorry for the inconvenience caused.
Kindly let us know answers for below questions for better understanding to help you further.
Are you able to connect internet?
Is this only happens with the McAfee website or also other websites?
Alternatively, you can always contact for immediate assistance or call our helpline number (8008109806 / 4000109806)China.
If this information was helpful in any way or answered your question, please mark it as the accepted solution and give Kudos if appropriate.
Regards,
Venkat