diff --git a/src/connection/connection.js b/src/connection/connection.js
index af6f6d6..9e26a25 100644
--- a/src/connection/connection.js
+++ b/src/connection/connection.js
@@ -400,6 +400,8 @@ class Connection extends EventEmitter {
             this.onRawDataPush(bufferReader);
         } else if(responseCode === Constants.PushCodes.LoginSuccess){
             this.onLoginSuccessPush(bufferReader);
+        } else if(responseCode === Constants.PushCodes.LoginFail){
+            this.onLoginFailPush(bufferReader);
         } else if(responseCode === Constants.PushCodes.StatusResponse){
             this.onStatusResponsePush(bufferReader);
         } else if(responseCode === Constants.PushCodes.LogRxData){
@@ -459,6 +461,13 @@ class Connection extends EventEmitter {
         });
     }
 
+    onLoginFailPush(bufferReader) {
+        this.emit(Constants.PushCodes.LoginFail, {
+            reserved: bufferReader.readByte(), // reserved
+            pubKeyPrefix: bufferReader.readBytes(6), // 6 bytes of public key this login fail is from
+        });
+    }
+
     onStatusResponsePush(bufferReader) {
         this.emit(Constants.PushCodes.StatusResponse, {
             reserved: bufferReader.readByte(), // reserved
diff --git a/src/constants.js b/src/constants.js
index 4ba7e78..5888057 100644
--- a/src/constants.js
+++ b/src/constants.js
@@ -101,7 +101,7 @@ class Constants {
         MsgWaiting: 0x83,
         RawData: 0x84,
         LoginSuccess: 0x85,
-        LoginFail: 0x86, // not usable yet
+        LoginFail: 0x86,
         StatusResponse: 0x87,
         LogRxData: 0x88,
         TraceData: 0x89,