> Source: [sk142355](https://support.checkpoint.com/results/sk/sk142355)

# sk142355 - VPN tunnel goes down after policy push, must be reset to bring it up

| Property | Value |
|----------|-------|
| Solution ID | sk142355 |
| Date Created | 2018-12-11 |
| Last Modified | 2022-11-24 |
| Technical Level | Advanced |
| Products | Security Gateway |
| Versions | R81.20, R81.10 (EOS), R81 (EOS) |
| OS | Gaia |

## Symptoms

- * VPN tunnel goes down after policy push, and the user needs to reset the tunnel to bring it up.

* In *vpnd.elg* , this log entry appears:  

  ```
  
  [vpnd 4874 4102518672]@Gateway[Time Stamp] SAdeleteAll: keep_IKE_SAs is not set
  ```

  This log entry later appears in *vpnd.elg*:

  ```
  
  [vpnd 4874 4102518672]@Gateway[Time Stamp] findSAByPeer: Valid ISAKMP SA was not found. me=0, peer=aabbccdd
  ```

* The VPN peer is a 3rd party vendor.

* This error appears in *vpnd.elg* :


  `TalkToEngine: Engine RC is << FWIKE_ERROR >>`


  At the same time the error occurs, the 3x DPD packets are missed in the ike.elg file.

## Cause

The **keep_IKE_SAs** option is not enabled.   

When this parameter is disabled, policy installation removes all Phase1 and Phase 2 keys.  

Enabling this parameter changes the behavior so that the Security Gateway keeps all Phase 1 and Phase 2 keys after a policy installation to work around interoperability issues with 3rd party VPN peers.  

<br />

## Solution

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