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I'm working on a project that uses URLSession with a client certificate authentication of HTTP requests. In case of an authentication error, I need to know the exact cause of the SSL error. Unfortunately, the task callback error only returns a "Connection lost" status and does not contain any useful information in the underlying error. Error Domain=NSURLErrorDomain Code=-1005 "The network connection was lost." UserInfo={_kCFStreamErrorCodeKey=-4, NSUnderlyingError=0x1007cc780 {Error Domain=kCFErrorDomainCFNetwork Code=-1005 "(null)" UserInfo={NSErrorPeerAddressKey=<CFData 0x109c08a50 [0x7fff8066ab70]>{length = 16, capacity = 16, bytes = 0x100201bb3369e6040000000000000000}, _kCFStreamErrorCodeKey=-4, _kCFStreamErrorDomainKey=4}}, _NSURLErrorFailingURLSessionTaskErrorKey=LocalDataTask <E0F9E193-0CE8-4B42-9E46-72166BA54F2A>.<1>, _NSURLErrorRelatedURLSessionTaskErrorKey=( "LocalDataTask <E0F9E193-0CE8-4B42-9E46-72166BA54F2A>.<1>" ) In the console logs, I can see what caused the error. For example, if the certificate is omitted: Error: 4454414168:error:1000045c:SSL routines:OPENSSL_internal:TLSV1_CERTIFICATE_REQUIRED:/System/Volumes/Data/SWE/macOS/BuildRoots/e90674e518/Library/Caches/com.apple.xbs/Sources/boringssl/boringssl-351.100.9/ssl/tls_record.cc:594:SSL Is there any way to retrieve that information without using a lower-level framework?