BT 問題

平時一向都有用開router.
BT 既時候一向都係綠燈.
上星期無端端變左黃燈.
琴日仲變埋灰燈..........
想問下各位師兄知唔知咩問題?

Assume there's no change on the network equipment and their settings :

- Check the firewall (both Windows and 3rd party) and anti-virus software on your PC

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