I'm trying to connect to a CAS 5.3.3 server using the `apereo/mod_auth_cas` 
master branch. Following sign-in, the browser reports 'Secure Connection 
Failed' (ERR_EMPTY_RESPONSE) and the Apache ticket cache is empty. Does the 
configuration below suggest a problem with the CAS certificate path?

Thanks for taking a look.
-Alan


LoadModule auth_cas_module /usr/lib/apache2/modules/mod_auth_cas.so
CASCertificatePath /etc/ssl/cert/CAS_SERVER_x509chain.pem

CASCookiePath /var/cache/apache2/mod_auth_cas/
CASLoginURL https://CAS_SERVER/cas/login
CASValidateURL https://CAS_SERVER/cas/samlValidate
CASValidateSAML On
CASAttributePrefix SAML-
CASDebug On

<LocationMatch ^/auth/>
    AuthType CAS
    AuthName "Authentication Required"
    CASAuthNHeader CAS-User
    Require valid-user
</LocationMatch>


[auth_cas:debug] [pid 20375] mod_auth_cas.c(2675): 
    entering check_vhost_config()

[auth_cas:debug] [pid 20376] mod_auth_cas.c(2675): 
    entering check_vhost_config()

[core:debug] [pid 20378] protocol.c(2316): 
    [client CLIENT_IP:49262] 
    AH03155: select protocol from , choices=h2,http/1.1 for server APP_HOST

[core:debug] [pid 20379] protocol.c(2316): 
    [client CLIENT_IP:49264] 
    AH03155: select protocol from , choices=h2,http/1.1 for server APP_HOST

[authz_core:debug] [pid 20379] mod_authz_core.c(820): 
    [client CLIENT_IP:49264]
   AH01626: authorization result of Require valid-user : denied (no 
authenticated user yet)

[authz_core:debug] [pid 20379] mod_authz_core.c(820): 
    [client CLIENT_IP:49264]
   AH01626: authorization result of <RequireAny>: denied (no authenticated 
user yet)

[auth_cas:debug] [pid 20379] mod_auth_cas.c(2159): 
    [client CLIENT_IP:49264] 
    Entering cas_authenticate()

[auth_cas:debug] [pid 20379] mod_auth_cas.c(610): 
    [client CLIENT_IP:49264] 
    CAS Service 'https%3a%2f%2fAPP_HOST%2fauth%2f'

[auth_cas:debug] [pid 20379] mod_auth_cas.c(558): 
    [client CLIENT_IP:49264] 
    entering getCASLoginURL()

[auth_cas:debug] [pid 20379] mod_auth_cas.c(535): 
    [client CLIENT_IP:49264] 
    entering getCASGateway()

[auth_cas:debug] [pid 20379] mod_auth_cas.c(625): 
    [client CLIENT_IP:49264] 
    entering redirectRequest()

[auth_cas:debug] [pid 20379] mod_auth_cas.c(637): 
    [client CLIENT_IP:49264] 
    Adding outgoing header: Location: 
https://CAS_SERVER/cas/login?service=https%3a%2f%2fAPP_HOST%2fauth%2f

[authz_core:debug] [pid 20378] mod_authz_core.c(820): 
    [client CLIENT_IP:49262] 
    AH01626: authorization result of Require valid-user : denied (no 
authenticated user yet),
   referer: 
https://CAS_SERVER/cas/login?service=https%3a%2f%2fAPP_HOST%2fauth%2f

[authz_core:debug] [pid 20378] mod_authz_core.c(820): 
    [client CLIENT_IP:49262]
   AH01626: authorization result of <RequireAny>: denied (no authenticated 
user yet),
   referer: 
https://CAS_SERVER/cas/login?service=https%3a%2f%2fAPP_HOST%2fauth%2f

[auth_cas:debug] [pid 20378] mod_auth_cas.c(2159): 
    [client CLIENT_IP:49262] 
    Entering cas_authenticate(),
   referer: 
https://CAS_SERVER/cas/login?service=https%3a%2f%2fAPP_HOST%2fauth%2f

[auth_cas:debug] [pid 20378] mod_auth_cas.c(682): 
    [client CLIENT_IP:49262] 
    Modified r->args (now ''),
   referer: 
https://CAS_SERVER/cas/login?service=https%3a%2f%2fAPP_HOST%2fauth%2f

[auth_cas:debug] [pid 20378] mod_auth_cas.c(1832): 
    [client CLIENT_IP:49262] 
    entering getResponseFromServer(),
   referer: 
https://CAS_SERVER/cas/login?service=https%3a%2f%2fAPP_HOST%2fauth%2f

[auth_cas:debug] [pid 20378] mod_auth_cas.c(1895): 
    [client CLIENT_IP:49262] 
    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="6cef759bedefebb9b13afbae6f18f368"
><samlp:AssertionArtifact>ST-53
-zxrvP6m7ACd--xeOLhHqVxQ-7MISFACAS3</samlp:AssertionArtifact></samlp:Request></SOAP-ENV:Body></SOAP-ENV:Envelope>,
   referer: 
https://CAS_SERVER/cas/login?service=https%3a%2f%2fAPP_HOST%2fauth%2f

[auth_cas:debug] [pid 20378] mod_auth_cas.c(610): 
    [client CLIENT_IP:49262] 
    CAS Service 'https%3a%2f%2fAPP_HOST%2fauth%2f',
   referer: 
https://CAS_SERVER/cas/login?service=https%3a%2f%2fAPP_HOST%2fauth%2f

[core:debug] [pid 20380] protocol.c(2316): 
    [client CLIENT_IP:49280]
   AH03155: select protocol from , choices=h2,http/1.1 for server APP_HOST

[authz_core:debug] [pid 20380] mod_authz_core.c(820): 
    [client CLIENT_IP:49280]
   AH01626: authorization result of Require valid-user : denied (no 
authenticated user yet),
   referer: 
https://CAS_SERVER/cas/login?service=https%3a%2f%2fAPP_HOST%2fauth%2f

[authz_core:debug] [pid 20380] mod_authz_core.c(820): 
    [client CLIENT_IP:49280]
   AH01626: authorization result of <RequireAny>: denied (no authenticated 
user yet),
   referer: 
https://CAS_SERVER/cas/login?service=https%3a%2f%2fAPP_HOST%2fauth%2f

[auth_cas:debug] [pid 20380] mod_auth_cas.c(2159): 
    [client CLIENT_IP:49280] 
    Entering cas_authenticate(),
   referer: 
https://CAS_SERVER/cas/login?service=https%3a%2f%2fAPP_HOST%2fauth%2f

[auth_cas:debug] [pid 20380] mod_auth_cas.c(682): 
    [client CLIENT_IP:49280] 
    Modified r->args (now ''),
   referer: 
https://CAS_SERVER/cas/login?service=https%3a%2f%2fAPP_HOST%2fauth%2f

[auth_cas:debug] [pid 20380] mod_auth_cas.c(1832): 
    [client CLIENT_IP:49280] 
    entering getResponseFromServer(),
   referer: 
https://CAS_SERVER/cas/login?service=https%3a%2f%2fAPP_HOST%2fauth%2f

[auth_cas:debug] [pid 20380] mod_auth_cas.c(1895): 
    [client CLIENT_IP:49280] 
    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="bd2e248cbb8aec0e1a8188502988c82e"
><samlp:AssertionArtifact>ST-53
-zxrvP6m7ACd--xeOLhHqVxQ-7MISFACAS3</samlp:AssertionArtifact></samlp:Request></SOAP-ENV:Body></SOAP-ENV:Envelope>,
   referer: 
https://CAS_SERVER/cas/login?service=https%3a%2f%2fAPP_HOST%2fauth%2f

[auth_cas:debug] [pid 20380] mod_auth_cas.c(610): 
    [client CLIENT_IP:49280] 
    CAS Service 'https%3a%2f%2fAPP_HOST%2fauth%2f',
   referer: 
https://CAS_SERVER/cas/login?service=https%3a%2f%2fAPP_HOST%2fauth%2f
   
[core:debug] [pid 20384] protocol.c(2316): 
    [client APP_HOST_IP:57578]
   AH03155: select protocol from , choices=http/1.1 for server APP_HOST

[authz_core:debug] [pid 20384] mod_authz_core.c(820): 
    [client APP_HOST_IP:57578]
   AH01626: authorization result of Require all granted: granted

[authz_core:debug] [pid 20384] mod_authz_core.c(820): 
    [client APP_HOST_IP:57578]
   AH01626: authorization result of <RequireAny>: granted


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