The error message you are seeing is indicating that the device is unable to establish a network connection to the specified endpoint. This can be caused by a variety of factors, including network issues, server issues, or changes to the iOS network stack. One potential cause of this issue could be changes to the iOS network stack that affect how your app is able to establish and maintain connections to external endpoints. This could be related to changes in how the operating system handles network connections, or changes in how your app interacts with the network stack. To troubleshoot this issue, you can try the following steps: Check the network connection: Ensure that the device is connected to a stable network connection, and that other apps on the device are able to access the internet. If the device is not connected to the internet, or the network connection is unstable, this could be causing the error. Review the server logs: Check the logs on the server-side to see if there are any issues with the endpoint that your app is attempting to access. If the server is experiencing issues, this could be causing the error. Increase the timeout interval: Increase the timeout interval for your network requests to give your app more time to establish a connection. You can do this by modifying the URLSessionConfiguration timeoutIntervalForResource and timeoutIntervalForRequest properties. Implement retries: Add retry logic to your app to retry failed network requests. This can help to mitigate issues caused by intermittent network connectivity or server-side issues. Implement a fallback mechanism: If the network request fails, implement a fallback mechanism to handle the error gracefully. This can include showing a message to the user that the app is unable to connect to the endpoint, or falling back to a cached version of the data if available. Update to the latest iOS version: Ensure that your app is running on the latest version of iOS to take advantage of any bug fixes or improvements to the network stack. If none of these steps resolve the issue, you may need to investigate further by reviewing your app's network code and debugging the issue using tools like Wireshark or Charles Proxy to capture network traffic.