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Hi @yafei253699 ,
Thanks for raising this to us. We did an article that you may find helpful, please see link below.
Troubleshooting no internet connection
To better understand the situation, please confirm the service address affected with the service and we'll proceed with initial test and investigation.
@yafei253699 wrote:Suddenly my nbn cannot be connected. Although it was disconnected a few days ago, it suddenly became unavailable today.