Index: modules/ssl/mod_ssl.c
===================================================================
--- modules/ssl/mod_ssl.c	(revision 1859292)
+++ modules/ssl/mod_ssl.c	(working copy)
@@ -448,10 +448,20 @@ static SSLConnRec *ssl_init_connection_ctx(conn_re
     SSLConnRec *sslconn = myConnConfig(c);
     int need_setup = 0;
 
+    /* mod_proxy's (r->)per_dir_config has the lifetime of the request, thus
+     * it uses ssl_engine_set() to reset sslconn->dc when reusing SSL backend
+     * connections, so we must fall through here. But in the case where we are
+     * called from ssl_init_ssl_connection() with no per_dir_config (which also
+     * includes mod_proxy's later run_pre_connection call), sslconn->dc should
+     * be preserved if it's already set.
+     */
     if (!sslconn) {
         sslconn = apr_pcalloc(c->pool, sizeof(*sslconn));
         need_setup = 1;
     }
+    else if (!new_proxy) {
+        return sslconn;
+    }
 
     /* Reinit dc in any case because it may be r->per_dir_config scoped
      * and thus a caller like mod_proxy needs to update it per request.