Index: subversion/libsvn_ra_serf/serf.c
===================================================================
--- subversion/libsvn_ra_serf/serf.c	(revision 25136)
+++ subversion/libsvn_ra_serf/serf.c	(working copy)
@@ -151,6 +151,7 @@
   serf_sess->conns[0]->bkt_alloc =
           serf_bucket_allocator_create(serf_sess->pool, NULL, NULL);
   serf_sess->conns[0]->session = serf_sess;
+  serf_sess->conns[0]->last_status_code = -1;
 
   /* fetch the DNS record for this host */
   status = apr_sockaddr_info_get(&serf_sess->conns[0]->address, url.hostname,
Index: subversion/libsvn_ra_serf/update.c
===================================================================
--- subversion/libsvn_ra_serf/update.c	(revision 25136)
+++ subversion/libsvn_ra_serf/update.c	(working copy)
@@ -2115,6 +2115,7 @@
       sess->conns[i]->hostinfo = sess->conns[0]->hostinfo;
       sess->conns[i]->using_ssl = sess->conns[0]->using_ssl;
       sess->conns[i]->using_compression = sess->conns[0]->using_compression;
+      sess->conns[i]->last_status_code = -1;
       sess->conns[i]->ssl_context = NULL;
       sess->conns[i]->session = sess;
       sess->conns[i]->auth_header = sess->auth_header;