Troubleshooting firewall issues
If sections of your Twilio Network Test failed, the reason could be your system’s firewall. Your firewall should allow outgoing UDP to connect to your internet from Google Chrome and allow return traffic in response.
Below are a set of options you can use to troubleshoot your firewall and connectivity issues.
Test on a different environment
If you’re not passing your Twilio Network Test or having connectivity issues, you might be on a bad network. Try switching over to a more secure connection or use a different computer and try again!
Temporarily disable your firewall
If you’re using an antivirus or firewall software, please ensure that Chrome and dscout are trusted or allowed by these programs.
Or you could temporarily disable your antivirus or firewall to see if this resolves the issue.You can simply disable your firewall and re-run the Twilio Network Test to see if your tests pass this time around.
Twilio whitelisted IP address ranges
For the more technical-savvy, you can configure your firewall to allow communication with Twilio's API. To do so, please refer to the following whitelisted IP address ranges:
|Server IP Address Range / Hostnames||Port and Protocol|
|18.104.22.168 - 22.214.171.124, 126.96.36.199 - 188.8.131.52||443 WSS|
Ports used: 10,000 - 20,000 UDP/SRTP/SRTCP
More information about Twilio’s requirements can be found here.