Laptop opening Teredo port

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Rolando Nispiros

• December 21, 2021 18:00

For some reason my work laptop is giving the following alarm, UDP Port 55128 on device, 'My Laptop' is open to the public permanently for Teredo xxx.xxx.xxx.xxx:55128->55128 UDP.

Does anyone know why I am getting this alert?  My laptop and other devices are connected to NordVPN configured on the Firewalla Gold.  My work IT department has no idea.

Should I block this open port?  I believe I blocked a similar alert sometime ago, but was/am still able to access work resources remotely.  I get this message, different ports, sporadically.

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  David Parish

  • January 04, 2022 11:34

  It is a Microsoft IPV6 tunneling service. 

  https://docs.microsoft.com/en-us/windows/win32/teredo/portal

  I block it on my network by adding a block entry in Firewalla for this domain: teredo.ipv6.microsoft.com

   

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  Rolando Nispiros

  • January 04, 2022 16:06

  Thank you for the link and info.  I'll try to do the same and see what happens.

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