> Source: [sk151114](https://support.checkpoint.com/results/sk/sk151114)

# sk151114 - "fwaccel off" does not have an effect on disabling acceleration of VPN tunnels starting from R80.20

| Property | Value |
|----------|-------|
| Solution ID | sk151114 |
| Date Created | 2019-04-11 |
| Last Modified | 2026-09-30 |
| Technical Level | Advanced |
| Products | Security Gateway |
| Versions | R81.20, R81.10 (EOS), R81 (EOS) |
| OS | Gaia |

## Symptoms

- * Disabling acceleration by running the "`fwaccel off`" does not have an immediate effect on IPsec acceleration, as it did in versions R80.10 and lower.

* Running the command "`fwaccel off`" causes every existing VPN connection to continue to be processed by SecureXL, and only new connections are not offloaded to the acceleration module.

* As long as there are accelerated VPN connections associated with the IPsec tunnel, all decryption/encryption operations will continue to be handled by SecureXL.

## Cause

**In Security Gateways version R80.20 - R81.20:**

The "`fwaccel off`" command does not stop the SecureXL device, and the communication between SecureXL and Firewall-1 is now **a**synchronous. SecureXL continues to handle all connections that it has already accelerated.

Furthermore, when new decryption/encryption keys are generated, the decision whether to accelerate the tunnel or not depends on whether there are accelerated connections associated with the tunnel.

As a result, to disable VPN tunnel acceleration, all outstanding related connections should be terminated.

**This behavior prevents disabling tunnel acceleration as long as accelerated connections are associated with those tunnels.**

|---------------------------------------------------------------------------------------------|
| **WARNING: VPN acceleration is mandatory and may be disabled only for debugging purposes.** |

## Solution

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