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I am receiving error while calling an API. What changes is required at the server end SSL settings so that there is no error. 2019-07-28 14:55:07.181881+0530 testapicall[10010:458910] [BoringSSL] boringssl_context_alert_callback_handler(3724) [C1.1:2][0x7fa57640a4b0] Alert level: fatal, description: handshake failure2019-07-28 14:55:07.182939+0530 testapicall[10010:458910] [BoringSSL] boringssl_session_errorlog(224) [C1.1:2][0x7fa57640a4b0] [boringssl_session_handshake_incomplete] SSL_ERROR_SSL(1): operation failed within the library2019-07-28 14:55:07.184616+0530 testapicall[10010:458910] [BoringSSL] boringssl_session_handshake_error_print(205) [C1.1:2][0x7fa57640a4b0] 140348630282504:error:10000410:SSL routines:OPENSSL_internal:SSLV3_ALERT_HANDSHAKE_FAILURE:/BuildRoot/Library/Caches/com.apple.xbs/Sources/boringssl_Sim/boringssl-109.250.2/ssl/tls_record.cc:586:SSL alert number 402019-07-28 14:55:07.185557+0530 testapicall[10010:458910] [BoringSSL] boringssl_session_handshake_error_print(205) [C1.1:2][0x7fa57640a4b0] 140348630282504:error:1000009a:SSL routines:OPENSSL_internal:HANDSHAKE_FAILURE_ON_CLIENT_HELLO:/BuildRoot/Library/Caches/com.apple.xbs/Sources/boringssl_Sim/boringssl-109.250.2/ssl/handshake.cc:576:2019-07-28 14:55:07.187198+0530 testapicall[10010:458910] [BoringSSL] boringssl_context_get_error_code(3545) [C1.1:2][0x7fa57640a4b0] SSL_AD_HANDSHAKE_FAILURE2019-07-28 14:55:07.196760+0530 testapicall[10010:458910] TIC TCP Conn Failed [1:0x600000b98cc0]: 3:-9824 Err(-9824)2019-07-28 14:55:07.198859+0530 testapicall[10010:458910] NSURLSession/NSURLConnection HTTP load failed (kCFStreamErrorDomainSSL, -9824)2019-07-28 14:55:07.203161+0530 testapicall[10010:458910] Task <2B7DB1CA-F5F5-442C-B72F-841FCA42481D>.<1> HTTP load failed (error code: -1200 [3:-9824])2019-07-28 14:55:07.203347+0530 testapicall[10010:458908] Task <2B7DB1CA-F5F5-442C-B72F-841FCA42481D>.<1> finished with error - code: -1200Fatal error: Unexpectedly found nil while unwrapping an Optional value2019-07-28 14:55:07.209401+0530 testapicall[10010:458910] Fatal error: Unexpectedly found nil while unwrapping an Optional value(lldb)