diff --git a/auth_test.go b/auth_test.go
index 3851c0c..a51b5cd 100644
--- a/auth_test.go
+++ b/auth_test.go
@@ -25,8 +25,14 @@ func TestAuth(t *testing.T) {
 		User:     "user_not_found",
 		Password: "qwerty",
 	})
+	ver, _ := tntBoxVersion(box)
+
 	if assert.Error(err) && assert.Nil(conn) {
-		assert.Contains(err.Error(), "is not found")
+		if ver >= version2_11_0 {
+			assert.Exactly(err.Error(), "User not found or supplied credentials are invalid")
+		} else {
+			assert.Contains(err.Error(), "is not found")
+		}
 	}
 
 	// bad password
@@ -34,8 +40,14 @@ func TestAuth(t *testing.T) {
 		User:     "tester",
 		Password: "qwerty",
 	})
+	ver, _ = tntBoxVersion(box)
+
 	if assert.Error(err) && assert.Nil(conn) {
-		assert.Contains(err.Error(), "Incorrect password supplied for user")
+		if ver >= version2_11_0 {
+			assert.Exactly(err.Error(), "User not found or supplied credentials are invalid")
+		} else {
+			assert.Contains(err.Error(), "Incorrect password supplied for user")
+		}
 	}
 
 	// ok user password
diff --git a/const.go b/const.go
index c72fd12..3ef7858 100644
--- a/const.go
+++ b/const.go
@@ -136,7 +136,7 @@ const (
 	ErrDropUser                      = uint(0x2c)  // Failed to drop user '%s': %s
 	ErrNoSuchUser                    = uint(0x2d)  // User '%s' is not found
 	ErrUserExists                    = uint(0x2e)  // User '%s' already exists
-	ErrPasswordMismatch              = uint(0x2f)  // Incorrect password supplied for user '%s'
+	ErrCredsMismatch                 = uint(0x2f)  // User not found or supplied credentials are invalid
 	ErrUnknownRequestType            = uint(0x30)  // Unknown request type %u
 	ErrUnknownSchemaObject           = uint(0x31)  // Unknown object type '%s'
 	ErrCreateFunction                = uint(0x32)  // Failed to create function '%s': %s