did you try unplugging the router and switching it back on?. Have you made any changes in the router like changing the password or connection protocol?.
Have you spoken to your ISP (Internet Service Provider) and ask them if there is a problem with the network. Are you connecting via a LAN network cable or via WiFi?. If you are using a LAN cable, have you checked it for damage or made sure it is sitting in the socket (both ends) correctly?.
It is important that you check whether the Virtual LAN that you use is updated.
Check if your Wifi or cable network connection works properly.
Also, what version of Hamachi do you use?
Check these things and revert to us so that we help you better.
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