diff --git a/src/or/connection_edge.c b/src/or/connection_edge.c
index e2f1d43b53..ba669fe8c3 100644
--- a/src/or/connection_edge.c
+++ b/src/or/connection_edge.c
@@ -652,8 +652,7 @@ addressmap_register(const char *address, char *new_address, time_t expires)
int
client_dns_incr_failures(const char *address)
{
- addressmap_entry_t *ent;
- ent = strmap_get(addressmap,address);
+ addressmap_entry_t *ent = strmap_get(addressmap, address);
if (!ent) {
ent = tor_malloc_zero(sizeof(addressmap_entry_t));
ent->expires = time(NULL)+MAX_DNS_ENTRY_AGE;
@@ -665,6 +664,19 @@ client_dns_incr_failures(const char *address)
return ent->num_resolve_failures;
}
+/** If address is in the client dns addressmap, reset
+ * the number of resolve failures we have on record for it.
+ * This is used when we fail a stream because it won't resolve:
+ * otherwise future attempts on that address will only try once.
+ */
+void
+client_dns_clear_failures(const char *address)
+{
+ addressmap_entry_t *ent = strmap_get(addressmap, address);
+ if (ent)
+ ent->num_resolve_failures = 0;
+}
+
/** Record the fact that address resolved to val.
* We can now use this in subsequent streams via addressmap_rewrite()
* so we can more correctly choose an exit that will allow address.
diff --git a/src/or/or.h b/src/or/or.h
index 62ac7fc2b3..4be0d4bceb 100644
--- a/src/or/or.h
+++ b/src/or/or.h
@@ -1490,6 +1490,7 @@ void addressmap_rewrite(char *address, size_t maxlen);
int addressmap_already_mapped(const char *address);
void addressmap_register(const char *address, char *new_address, time_t expires);
int client_dns_incr_failures(const char *address);
+void client_dns_clear_failures(const char *address);
void client_dns_set_addressmap(const char *address, uint32_t val, const char *exitname);
const char *addressmap_register_virtual_address(int type, char *new_address);
void addressmap_get_mappings(smartlist_t *sl, time_t min_expires, time_t max_expires);
diff --git a/src/or/relay.c b/src/or/relay.c
index 682fe82e17..c2dada534b 100644
--- a/src/or/relay.c
+++ b/src/or/relay.c
@@ -678,6 +678,8 @@ connection_edge_process_end_not_open(
} else {
log_fn(LOG_NOTICE,"Have tried resolving address '%s' at %d different places. Giving up.",
safe_str(conn->socks_request->address), MAX_RESOLVE_FAILURES);
+ /* clear the failures, so it will have a full try next time */
+ client_dns_clear_failures(conn->socks_request->address);
}
break;
case END_STREAM_REASON_HIBERNATING: