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Question

Surfboard S33v3 no internet output

  • December 6, 2025
  • 1 reply
  • 15 views

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I just purchased the Surfboard S33v3 modem and worked with my ISP (Xfinity) to have it registered and connected. They mentioned they are getting signals and I verified through their app.

The modem itself has a solid blue light in front of the modem and my ethernet cable going to router or any other device I attach it to has a green light (solid but flashes very quickly).

For what reason, nothing is getting Internet still.

Would appreciate any help. Thanks!

1 reply

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Make sure that only one Ethernet port is connected to the modem. If both Ethernet ports are used simultaneously, the modem will not provide an internet connection. This is because when your Internet Service Provider (ISP) activates the modem, it typically assigns only one public IP address, which supports a single connection.

If you want to use both Ethernet ports on the SB8200 at the same time, you will need to contact your ISP and request activation of a second public IP address.

To isolate the issue, we recommend connecting a computer directly to the modem and removing the router. After disconnecting the router, reboot the modem and then connect the computer to check if it receives an internet connection.