Webinars

Optimising Your Network Settings for Webinars

TwentyThree employs global infrastructure to connect webinar producers and speakers, and the product uses real-time communication protocols on the browser for live video, audio and messages. In most cases, you won't need to make any network changes to connect, but in some settings network communications may be blocked by the network administrator — these blocks may need to be reconfigured to allow webinar producers and speakers to connect correctly.

If you have problems connecting to webinars on TwentyThree:

Using and Reading the TwentyThree Connection Test

We recommend you take the full TwentyThree network test before each webinar. To create accurate results, use the same network and device set-up as you will for your webinar. You can find the network test from your webinar’s Overview page towards the bottom of the right-hand sidebar. Click on “Take the full test,” and the test will open in a new browser tab. When you click “Start the test,” your browser, microphone, camera, network, connectivity and throughput will be tested. 

In order to test your browser and microphone, you'll need to make sure to give access to those devices in the browser. During the microphone test, you will need to ensure that audio is actively being transmitted through the microphone, so try talking or otherwise making a sound. 

Once the test is complete, you'll see which aspects of the test have been passed — indicated by a green checkmark — and the ones with warnings — indicated with a red warning triangle. Here is how to troubleshoot these errors: 

Browser: Make sure you are using a Chrome browser. If you are already using Google Chrome, try updating your browser to the latest version. 

Microphone: Make sure your microphone is not muted or turned off. Make sure that you are actively talking or otherwise making some noise while the test runs. If you're using an external microphone, you might also want to try to unplug and plug it in again while making sure that Chrome has the correct device selected. 

Camera: Make sure that your camera is on and connected. If you're using an external camera, you might want to unplug and plug it in again and make sure that Chrome has the correct device selected. 

Network, Connectivity and Throughput: These network tests are to make sure that your browser can connect to the webinar infrastructure and that you have sufficient bandwidth to run a high-quality webinar. If you see any issue during the test, refer to the guide on network configuration below.

Network Requirements

In order to ensure quality for producers and speakers alike, it may be required to have some network ports opened on your corporate network. If you have any connection issues for producers or speakers we recommend that you check that the guidelines below have been followed

The product uses standard HTTPS/SSL/TLS communication for loading the application and for data to flow with the API. We also use two additional protocols to increase the quality of connection and videos: 

The following domains must be opened for WebSockets:


The following IP ranges are used for media signaling and global video realtime relays. The ranges must be opened for TCP on port 80, 443, 3478 and 5349. Additionally, the ranges should be opened for UDP/SRTP/SRTCP on port 3478 and ports 10,000–60,000 to ensure the highest possible quality:

Using and Reading the Twilio Connection Test

If you experience issues with your connection during webinars and want a deeper analysis of your network connection you can take the Twilio network test. The test is more robust than the TwentyThree one and can help provide further insights on which aspects of your connection might be the cause. 

To take the test, go to http://networktest.twilio.com/. The test will automatically start once the page loads, and like with the TwentyThree test, you will need to provide the page access to your microphone and camera. During the microphone test, you will be asked to record a message, during which you need to actively talk or otherwise make a sound to be recorded for the test. 

Once the test is complete, you will see which aspects of the test were passed and which were failed on the left-hand side along with a log of further information on the different test aspects on the right side.

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