Index: modules/proxy/mod_proxy_connect.c
===================================================================
--- modules/proxy/mod_proxy_connect.c	(revision 1307883)
+++ modules/proxy/mod_proxy_connect.c	(working copy)
@@ -365,6 +365,7 @@
         backconn->aborted = 1;
         ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(01022)
                       "pre_connection setup failed (%d)", rc);
+        apr_socket_close(sock);
         return HTTP_INTERNAL_SERVER_ERROR;
     }