iOS 15 Calls Blocked by Device Firewall
Incident Report for Inc.
The iOS 15.4 update appears to have resolved the errors preventing calls from being made. We are considering this incident resolved.
Posted Apr 07, 2022 - 10:27 EDT
Apple did not include the fix for the iCloud Relay issue in the iOS 15.3 update as we anticipated. We now expect the fix should be included in the iOS 15.4 update expected in the first half of March.
Posted Feb 21, 2022 - 14:45 EST
Monitoring developers were able to confirm the 'firewall errors' on iOS and MacOS devices are being generated by Apple's 'iCloud Relay' update. This is a complex VPN-like system designed to obscure your IP address and encrypt your traffic over the internet. We were able to determine that the code with the networking changes to support this new feature is enabled, even if the feature itself is not.

Apple has developed a fix for this which is expected to be rolled out with iOS 15.3. We do not know when 15.3 is expected. We have also applied an update to change how iOS devices are being routed through the connection process that does not conflict with the Apple update to mitigate this problem until Apple's fix has been made public.

We are seeing more than 80% reduction in the errors being logged since our fix was deployed.
Posted Jan 20, 2022 - 16:22 EST
We have identified a setting that is enabled by default on updated iOS devices that is preventing calls from connecting. To correct this, please disable the 'WebRTC PlatformUDP Sockets' setting.

On iPhone or iPad:
1. Open up the device’s settings
2. Navigate to Safari > Advanced > Experimental Features
3. Disable WebRTC Platform UDP Sockets.
4. Close Safari and open it again.
5. Log back into
Posted Dec 02, 2021 - 09:19 EST
This incident affected: webpages.