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As I am preparing for the latest iOS 15.4 rollout, I downloaded the latest Xcode 13.3 beta 2 update. To my surprise a previous standard REST call made in my app is now failing with the following network issue when running on an iPhone 13 Pro with iOS 15.4 (beta2). 2022-02-10 11:11:00.944 [Info] [main] [AlamofireNetworkService.swift:24] fetch(route:) > post: https://site.serverdev.net:18100/Users?action=login 2022-02-10 11:11:01.087121-0500 MyApp[50029:13165667] [connection] nw_socket_handle_socket_event [C8.1:3] Socket SO_ERROR [54: Connection reset by peer] 2022-02-10 11:11:01.091555-0500 MyApp[50029:13165884] [boringssl] boringssl_metrics_log_metric_block_invoke(153) Failed to log metrics 2022-02-10 11:11:01.104522-0500 MyApp[50029:13165667] Connection 8: received failure notification 2022-02-10 11:11:01.104715-0500 MyApp[50029:13165667] Connection 8: received ECONNRESET with incomplete TLS handshake - generating errSSLClosedNoNotify 2022-02-10 11:11:01.105049-0500 MyApp[50029:13165667] Connection 8: failed to connect 3:-9816, reason -1 2022-02-10 11:11:01.105174-0500 MyApp[50029:13165667] Connection 8: encountered error(3:-9816) 2022-02-10 11:11:01.106574-0500 MyApp[50029:13165667] Task <F53C7A17-7297-4566-9746-1D39807E8356>.<5> HTTP load failed, 0/0 bytes (error code: -1200 [3:-9816]) 2022-02-10 11:11:01.118796-0500 MyApp[50029:13165920] Task <F53C7A17-7297-4566-9746-1D39807E8356>.<5> finished with error [-1200] Error Domain=NSURLErrorDomain Code=-1200 "An SSL error has occurred and a secure connection to the server cannot be made." UserInfo={NSErrorFailingURLStringKey=https://site.serverdev.net:18100/Users%3Faction=login, NSLocalizedRecoverySuggestion=Would you like to connect to the server anyway?, _kCFStreamErrorDomainKey=3, _NSURLErrorFailingURLSessionTaskErrorKey=LocalDataTask <F53C7A17-7297-4566-9746-1D39807E8356>.<5>, _NSURLErrorRelatedURLSessionTaskErrorKey=(   "LocalDataTask <F53C7A17-7297-4566-9746-1D39807E8356>.<5>" ), NSLocalizedDescription=An SSL error has occurred and a secure connection to the server cannot be made., NSErrorFailingURLKey=https://site.serverdev.net:18100/Users%3Faction=login, NSUnderlyingError=0x6000016e6850 {Error Domain=kCFErrorDomainCFNetwork Code=-1200 "(null)" UserInfo={_kCFStreamPropertySSLClientCertificateState=0, _kCFNetworkCFStreamSSLErrorOriginalValue=-9816, _kCFStreamErrorDomainKey=3, _kCFStreamErrorCodeKey=-9816, _NSURLErrorNWPathKey=satisfied (Path is satisfied), interface: utun3}}, _kCFStreamErrorCodeKey=-9816} I see there is an error related to the TLS handshake and following that a generic error saying "a secure connection to the server cannot be made". I ran the same call against the iPhone 13 Pro with iOS 15.0 on the same Xcode 13.3 beta2 version and the call succeeds as expected. This leaves me to believe the issue is tied to the iOS 15.4 beta layer. The release notes don't state any particular mention of SSL requirement changes and am wondering how else I can go about to investigate this issue. (The server I am communicating with enforces TLS 1.2)