Here's the Apache log with the additional log reporting lines. It makes it to lines 1904 and 1906, but then seems to fail on `curl_easy_perform`.
[Fri Dec 13 16:43:48.345565 2019] [auth_cas:debug] [pid 9977] mod_auth_cas.c (1832): [client CLIENT_IP:35632] entering getResponseFromServer(), referer: https://CAS_SERVER/cas/login?service=https%3a%2f%2fAPP_SERVER%2fauth%2f [Fri Dec 13 16:43:48.345651 2019] [auth_cas:debug] [pid 9977] mod_auth_cas.c (1895): [client CLIENT_IP:35632] samlPayload = <?xml version="1.0" encoding= "utf-8"?><SOAP-ENV:Envelope xmlns:SOAP-ENV= "http://schemas.xmlsoap.org/soap/envelope/";><SOAP-ENV:Header/><SOAP-ENV:Body ><samlp:Request xmlns:samlp="urn:oasis:names:tc:SAML:1.0:protocol" MajorVersion="1" MinorVersion="1" RequestID= "d9b827223ed99d990cc8ebdf7e9baeca"><samlp:AssertionArtifact>ST-9-OQvPfKXueVO -Tz5dQWATBIktFG4SFACAS3</samlp:AssertionArtifact></samlp:Request></SOAP-ENV: Body></SOAP-ENV:Envelope>, referer: https: //CAS_SERVER/cas/login?service=https%3a%2f%2fAPP_SERVER%2fauth%2f [Fri Dec 13 16:43:48.345666 2019] [auth_cas:debug] [pid 9977] mod_auth_cas.c (610): [client CLIENT_IP:35632] CAS Service 'https%3a%2f%2fAPP_SERVER%2fauth%2f', referer: https: //CAS_SERVER/cas/login?service=https%3a%2f%2fAPP_SERVER%2fauth%2f [Fri Dec 13 16:43:48.345673 2019] [auth_cas:debug] [pid 9977] mod_auth_cas.c (1904): [client CLIENT_IP:35632] ****** point 1, referer: https: //CAS_SERVER/cas/login?service=https%3a%2f%2fAPP_SERVER%2fauth%2f [Fri Dec 13 16:43:48.345688 2019] [auth_cas:debug] [pid 9977] mod_auth_cas.c (1906): [client CLIENT_IP:35632] ****** point 2, referer: https: //CAS_SERVER/cas/login?service=https%3a%2f%2fAPP_SERVER%2fauth%2f [Fri Dec 13 16:44:20.816146 2019] [ssl:info] [pid 9978] [client APP_SERVER_IP:38236] AH01964: Connection to child 2 established (server APP_SERVER:443) [Fri Dec 13 16:44:20.816483 2019] [ssl:debug] [pid 9978] ssl_engine_kernel.c (2388): [client APP_SERVER_IP:38236] AH02645: Server name not provided via TLS extension (using default/first virtual host) [Fri Dec 13 16:44:20.816503 2019] [ssl:debug] [pid 9978] ssl_engine_kernel.c (2388): [client APP_SERVER_IP:38236] AH02645: Server name not provided via TLS extension (using default/first virtual host) [Fri Dec 13 16:44:20.816514 2019] [core:debug] [pid 9978] protocol.c(2316): [client APP_SERVER_IP:38236] AH03155: select protocol from , choices=http/ 1.1 for server APP_SERVER [Fri Dec 13 16:44:20.821920 2019] [ssl:debug] [pid 9978] ssl_engine_kernel.c (2236): [client APP_SERVER_IP:38236] AH02041: Protocol: TLSv1.3, Cipher: TLS_AES_256_GCM_SHA384 (256/256 bits) [Fri Dec 13 16:44:20.821994 2019] [socache_shmcb:debug] [pid 9978] mod_socache_shmcb.c(495): AH00831: socache_shmcb_store (0xd2 -> subcache 18) [Fri Dec 13 16:44:20.822009 2019] [socache_shmcb:debug] [pid 9978] mod_socache_shmcb.c(849): AH00847: insert happened at idx=0, data=(0:32) [Fri Dec 13 16:44:20.822018 2019] [socache_shmcb:debug] [pid 9978] mod_socache_shmcb.c(854): AH00848: finished insert, subcache: idx_pos/ idx_used=0/1, data_pos/data_used=0/201 [Fri Dec 13 16:44:20.822026 2019] [socache_shmcb:debug] [pid 9978] mod_socache_shmcb.c(516): AH00834: leaving socache_shmcb_store successfully [Fri Dec 13 16:44:20.822167 2019] [socache_shmcb:debug] [pid 9978] mod_socache_shmcb.c(495): AH00831: socache_shmcb_store (0x8a -> subcache 10) [Fri Dec 13 16:44:20.822185 2019] [socache_shmcb:debug] [pid 9978] mod_socache_shmcb.c(849): AH00847: insert happened at idx=1, data=(222:254) [Fri Dec 13 16:44:20.822194 2019] [socache_shmcb:debug] [pid 9978] mod_socache_shmcb.c(854): AH00848: finished insert, subcache: idx_pos/ idx_used=0/2, data_pos/data_used=0/423 [Fri Dec 13 16:44:20.822202 2019] [socache_shmcb:debug] [pid 9978] mod_socache_shmcb.c(516): AH00834: leaving socache_shmcb_store successfully [Fri Dec 13 16:44:20.822360 2019] [ssl:debug] [pid 9978] ssl_engine_kernel.c (383): [client APP_SERVER_IP:38236] AH02034: Initial (No.1) HTTPS request received for child 2 (server APP_SERVER:443) [Fri Dec 13 16:44:20.822461 2019] [authz_core:debug] [pid 9978] mod_authz_core.c(820): [client APP_SERVER_IP:38236] AH01626: authorization result of Require all granted: granted [Fri Dec 13 16:44:20.822475 2019] [authz_core:debug] [pid 9978] mod_authz_core.c(820): [client APP_SERVER_IP:38236] AH01626: authorization result of <RequireAny>: granted [Fri Dec 13 16:44:20.822587 2019] [authz_core:debug] [pid 9978] mod_authz_core.c(820): [client APP_SERVER_IP:38236] AH01626: authorization result of Require all granted: granted [Fri Dec 13 16:44:20.822602 2019] [authz_core:debug] [pid 9978] mod_authz_core.c(820): [client APP_SERVER_IP:38236] AH01626: authorization result of <RequireAny>: granted [Fri Dec 13 16:44:20.822688 2019] [authz_core:debug] [pid 9978] mod_authz_core.c(820): [client APP_SERVER_IP:38236] AH01626: authorization result of Require all granted: granted [Fri Dec 13 16:44:20.822701 2019] [authz_core:debug] [pid 9978] mod_authz_core.c(820): [client APP_SERVER_IP:38236] AH01626: authorization result of <RequireAny>: granted [Fri Dec 13 16:44:20.822927 2019] [authz_core:debug] [pid 9978] mod_authz_core.c(820): [client APP_SERVER_IP:38236] AH01626: authorization result of Require all granted: granted [Fri Dec 13 16:44:20.822943 2019] [authz_core:debug] [pid 9978] mod_authz_core.c(820): [client APP_SERVER_IP:38236] AH01626: authorization result of <RequireAny>: granted [Fri Dec 13 16:44:20.823016 2019] [authz_core:debug] [pid 9978] mod_authz_core.c(820): [client APP_SERVER_IP:38236] AH01626: authorization result of Require all granted: granted [Fri Dec 13 16:44:20.823030 2019] [authz_core:debug] [pid 9978] mod_authz_core.c(820): [client APP_SERVER_IP:38236] AH01626: authorization result of <RequireAny>: granted [Fri Dec 13 16:44:20.825002 2019] [ssl:debug] [pid 9978] ssl_engine_io.c( 1106): [client APP_SERVER_IP:38236] AH02001: Connection closed to child 2 with standard shutdown (server APP_SERVER:443) -- - Website: https://apereo.github.io/cas - Gitter Chatroom: https://gitter.im/apereo/cas - List Guidelines: https://goo.gl/1VRrw7 - Contributions: https://goo.gl/mh7qDG 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