commit 7928104d5befa57d6bfd234311932e043ac28192
Author: Bingyu Shen <ahshenbingyu@gmail.com>
Date:   Tue Sep 8 12:31:54 2020 -0700

    Patch for authz_dbd

diff --git a/modules/aaa/mod_authz_dbd.c b/modules/aaa/mod_authz_dbd.c
index e1bb623..b07cc08 100644
--- a/modules/aaa/mod_authz_dbd.c
+++ b/modules/aaa/mod_authz_dbd.c
@@ -311,6 +311,11 @@ static authz_status dbdgroup_check_authorization(request_rec *r,
             return AUTHZ_GRANTED;
         }
     }
+    
+    ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO()
+                  "authz_dbd authorize: Authorization of user %s to access %s failed, reason: "
+                  "user is not part of the 'require'ed dbd-group(s).",
+                  r->user, r->uri);
 
     return AUTHZ_DENIED;
 }