4, network instability result, we recommend you to check your computer''s network card is lit, the network connection is displayed normal method of blocking a lot of QQ , the following first look at the most commonly used "blocking port Act." QQ is used by the UDP protocol, the default communication port is 4000, so long as the gateway on the development of filtering rules, the source UDP port 4000 to filter out packets can be blocked on the QQ''s. It may be your port number is modified, please try to modify the port number you

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