Forum Discussion
SFB UDP Ports
Hi Team,
I would just like to get your expert inputs on this. Currently, UDP Ports :3478, 3479, 3480, 3481 are not allowed in our firewall, would there be any issues if we will allow these ports to our network?
Also, can you tell me what is the purpose of these ports: UDP: 3478, 3479, 3480
Issue: We are experiencing high latency with our Skype calls and we are under the impression that these ports would make our connection better. Reference: https://docs.microsoft.com/en-us/office365/enterprise/urls-and-ip-address-ranges#skype-for-business-online-and-microsoft-teams
Appreciate your quick response.
Thanks!
Will
Hi Will,
The ports you mentioned are used for the realtime communication part (e.g. Audio, Video, Sharing) of SfB and Teams. So you should definitly use/allow them. If you don't open them, there is a fallback used via Port 443/TCP. This is the mode your environment currently running in.
These ports fall in the category of optimize. You can find the recommendations for this kind of traffic here:
https://docs.microsoft.com/en-us/office365/enterprise/office-365-network-connectivity-principles?redirectSourcePath=%252fen-us%252farticle%252foffice-365-network-connectivity-principles-76e7f232-917a-4b13-8fe2-4f8dbccfe041#new-office-365-endpoint-categories
If you are planning a change with the network Team I would recommend the Network Testing Companion. This allows you to simulate calls and test network connectivity for these ports.
You can find a blog article from Erwin Bierens how to install this here: https://erwinbierens.com/skype-for-business-and-microsoft-teams-network-testing/
Regards,
Paul
6 Replies
Hi Will,
The ports you mentioned are used for the realtime communication part (e.g. Audio, Video, Sharing) of SfB and Teams. So you should definitly use/allow them. If you don't open them, there is a fallback used via Port 443/TCP. This is the mode your environment currently running in.
These ports fall in the category of optimize. You can find the recommendations for this kind of traffic here:
https://docs.microsoft.com/en-us/office365/enterprise/office-365-network-connectivity-principles?redirectSourcePath=%252fen-us%252farticle%252foffice-365-network-connectivity-principles-76e7f232-917a-4b13-8fe2-4f8dbccfe041#new-office-365-endpoint-categories
If you are planning a change with the network Team I would recommend the Network Testing Companion. This allows you to simulate calls and test network connectivity for these ports.
You can find a blog article from Erwin Bierens how to install this here: https://erwinbierens.com/skype-for-business-and-microsoft-teams-network-testing/
Regards,
Paul
Paul Lange Thanks for the prompt response. I tried installing this tool but i could not find it in my desktop nor in my program, I am now stock in step 6. Do you know where will I find it? Please see attached.
I tried searching it through "search bar" and newly installed program but its not there.
Thanks!
- If you can't find the shortcuts, try this to start the Tool:
Windows + R and then paste %SystemRoot%\system32\WindowsPowerShell\v1.0\powershell.exe -WindowStyle Hidden -Command & {Invoke-NetworkTestingClient}
