# ipsec option tx-invalid-cookie

#### Syntax

[ no ] ipsec option tx-invalid-cookie

#### Release Information

Command introduced in JunosE Release 8.1.0.

#### Description

Enables transmission of invalid cookie notification for the current virtual router (transport VR). With invalid cookie notification enabled, the router signals to an ISAKMP peer when it does not recognize an IKE phase 1 message received from the peer. The no version restores the default setting, disabled.

#### Mode

Global Configuration