More Additional Information: Setting HTTP Proxy to "Auto" with empty URL resolves the issue I have found additional information regarding this issue. In the environment where the issue occurs (iPad with A16 Bionic, iPadOS 26.2), I applied the following Wi-Fi setting: HTTP Proxy: Auto URL: (Left blank) After applying this change, the iPad stopped sending RST packets, and the WebSocket connection became stable. Does this suggest that the issue might be related to the internal logic that determines whether a destination is on the local network or not? It seems that by setting the proxy to "Auto" (even with an empty URL), the OS changes how it handles the connection establishment or its filtering logic, which somehow prevents the unexpected RST packets. Has anyone else observed similar behavior where proxy configuration affects WebSocket stability on iPadOS?

Additional Information: iPhoneSE(Generation unknown - details from client) running iOS 26.0.1: The WebSocket disconnection issue did not occur. Any iPad running iPadOS 26.0.1: I wanted to test this, but I couldn't perform the verification as I didn't have a corresponding device on hand. iPad(A16) running iPadOS 26.2: When accessing directly via the Chrome browser, the WebSocket remained stable and did not disconnect. However, the issue was reproducible when using the PWA version (installed via Chrome). (Does the PWA use the Safari/WebKit engine internally even when installed through Chrome?) Additionally, I found logs corresponding to the time of the occurrence under Settings > Privacy & Security > Analytics & Improvements > Analytics Data. I am attaching those files to this post for reference. ExcUserFault_MobileSafari-2026-01-05-144423.000.ips ExcUserFault_SafariViewService-2026-01-05-144250.ips ExcUserFault_MobileSafari-2026-01-05-143829.ips ExcUserFault_SafariViewService-2026-01-05-143243.ips

https://feedbackassistant.apple.com/feedback/21416603 is reported feedback. Thank you.