--- httpd-2.4.3.org/modules/proxy/mod_proxy_connect.c   2013-02-04 13:44:39.000000000 +0100
+++ httpd-2.4.3/modules/proxy/mod_proxy_connect.c       2013-02-04 13:39:08.000000000 +0100
@@ -487,6 +487,7 @@
         ap_lingering_close(backconn);
 
     c->aborted = 1;
+    c->keepalive = AP_CONN_CLOSE;
 
     return OK;
 }