diff --git a/proto/connections_enums.proto b/proto/connections_enums.proto
index 6873d7dc..ccc7aa7d 100644
--- a/proto/connections_enums.proto
+++ b/proto/connections_enums.proto
@@ -170,6 +170,7 @@ enum DisconnectionReason {
   SHUTDOWN = 5;
   UNFINISHED = 6;
   PREV_CHANNEL_DISCONNECTION_IN_RECONNECT = 7;
+  AUTHENTICATION_FAILURE = 8;
 }
 
 // The type of a Payload.